From 47b7b492d37e8edfb7d066aba847b9712b4044b6 Mon Sep 17 00:00:00 2001
From: t8y2 <t8y2@users.noreply.github.com>
Date: Tue, 13 Oct 2026 16:14:58 +0800
Subject: [PATCH] fix(data): harden transfer and comparison workflows

---
 .../src/components/diff/DataCompareDialog.vue |  20 +-
 .../DataCompareDialog.keyColumns.spec.ts      |   1 +
 .../DataCompareDialog.prefill.spec.ts         |   1 +
 .../__tests__/useDataCompareSession.spec.ts   |  10 +-
 .../src/composables/useDataCompareSession.ts  |  21 +-
 apps/desktop/src/i18n/locales/en.ts           |   4 +-
 apps/desktop/src/i18n/locales/zh-CN.ts        |   4 +-
 .../database/databaseDriverManifest.spec.ts   |  27 +-
 apps/desktop/src/lib/dataGrid/dataCompare.ts  |   4 +-
 .../databaseCompareCapabilities.spec.ts       |  16 +
 .../database/databaseCompareCapabilities.ts   |  78 +-
 .../lib/database/databaseDriverManifest.ts    |  18 +
 .../src/lib/database/transferObjectKinds.ts   |  17 +-
 .../assets/database-drivers.manifest.json     | 279 +++++++
 crates/dbx-core/src/data/correction.rs        |   1 +
 crates/dbx-core/src/data/data_compare.rs      | 120 ++-
 crates/dbx-core/src/data/mod.rs               |   2 +
 crates/dbx-core/src/data/sample_pairing.rs    |  18 +
 crates/dbx-core/src/data/transfer.rs          |  41 +-
 crates/dbx-core/src/data/transfer_runner.rs   | 694 ++++++++++++++++++
 crates/dbx-core/src/lib.rs                    |   1 +
 .../tests/regression_compatibility.rs         |  39 +-
 crates/dbx-core/tests/sample_pairing.rs       |  26 +
 crates/dbx-types/src/database_manifest.rs     |  71 ++
 crates/dbx-web/src/routes/transfer.rs         | 508 +------------
 plugins/connection-types/access.yaml          |   1 +
 plugins/connection-types/argo.yaml            |   2 +
 plugins/connection-types/bigquery.yaml        |   1 +
 plugins/connection-types/clickhouse.yaml      |   2 +
 plugins/connection-types/cloudflare-d1.yaml   |   2 +
 plugins/connection-types/dameng.yaml          |   3 +
 plugins/connection-types/databend.yaml        |   1 +
 plugins/connection-types/databricks.yaml      |   1 +
 plugins/connection-types/db2.yaml             |   2 +
 plugins/connection-types/doris.yaml           |   1 +
 plugins/connection-types/duckdb.yaml          |   2 +
 plugins/connection-types/exasol.yaml          |   1 +
 plugins/connection-types/firebird.yaml        |   1 +
 plugins/connection-types/gaussdb.yaml         |   3 +
 plugins/connection-types/gbase.yaml           |   2 +
 plugins/connection-types/goldendb.yaml        |   2 +
 plugins/connection-types/h2.yaml              |   2 +
 plugins/connection-types/highgo.yaml          |   2 +
 plugins/connection-types/hive.yaml            |   2 +
 plugins/connection-types/ignite.yaml          |   1 +
 plugins/connection-types/ignite3.yaml         |   1 +
 plugins/connection-types/impala.yaml          |   2 +
 plugins/connection-types/influxdb3.yaml       |   1 +
 plugins/connection-types/informix.yaml        |   1 +
 plugins/connection-types/iotdb.yaml           |   1 +
 plugins/connection-types/iris.yaml            |   2 +
 plugins/connection-types/kingbase.yaml        |   3 +
 plugins/connection-types/kwdb.yaml            |   3 +
 plugins/connection-types/kylin.yaml           |   1 +
 plugins/connection-types/kyuubi.yaml          |   2 +
 plugins/connection-types/manticoresearch.yaml |   1 +
 plugins/connection-types/mongodb.yaml         |   1 +
 plugins/connection-types/mysql.yaml           |   3 +
 .../connection-types/oceanbase-oracle.yaml    |   3 +
 plugins/connection-types/opengauss.yaml       |   3 +
 plugins/connection-types/oracle.yaml          |   3 +
 plugins/connection-types/oscar.yaml           |   1 +
 plugins/connection-types/postgres.yaml        |   3 +
 plugins/connection-types/prestosql.yaml       |   1 +
 plugins/connection-types/questdb.yaml         |   2 +
 plugins/connection-types/redshift.yaml        |   1 +
 plugins/connection-types/rqlite.yaml          |   2 +
 plugins/connection-types/saphana.yaml         |   1 +
 plugins/connection-types/snowflake.yaml       |   1 +
 plugins/connection-types/spanner.yaml         |   1 +
 plugins/connection-types/spark.yaml           |   2 +
 plugins/connection-types/sqlite.yaml          |   2 +
 plugins/connection-types/sqlserver.yaml       |   3 +
 plugins/connection-types/starrocks.yaml       |   1 +
 plugins/connection-types/sundb.yaml           |   1 +
 plugins/connection-types/tdengine.yaml        |   1 +
 plugins/connection-types/teradata.yaml        |   1 +
 plugins/connection-types/transwarp.yaml       |   2 +
 plugins/connection-types/trino.yaml           |   1 +
 plugins/connection-types/turso.yaml           |   2 +
 plugins/connection-types/uxdb.yaml            |   1 +
 plugins/connection-types/vastbase.yaml        |   2 +
 plugins/connection-types/vertica.yaml         |   1 +
 plugins/connection-types/xugu.yaml            |   2 +
 plugins/connection-types/yashandb.yaml        |   2 +
 scripts/core-architecture.test.mjs            |  32 +
 scripts/sync-connection-types.mjs             |  30 +
 src-tauri/src/commands/transfer.rs            | 535 +-------------
 88 files changed, 1564 insertions(+), 1156 deletions(-)
 create mode 100644 apps/desktop/src/lib/database/__tests__/databaseCompareCapabilities.spec.ts
 create mode 100644 crates/dbx-core/src/data/sample_pairing.rs
 create mode 100644 crates/dbx-core/src/data/transfer_runner.rs
 create mode 100644 crates/dbx-core/tests/sample_pairing.rs

diff --git a/apps/desktop/src/components/diff/DataCompareDialog.vue b/apps/desktop/src/components/diff/DataCompareDialog.vue
index 30203edc10..15d610b142 100644
--- a/apps/desktop/src/components/diff/DataCompareDialog.vue
+++ b/apps/desktop/src/components/diff/DataCompareDialog.vue
@@ -833,6 +833,7 @@ function toggleShowAll(table: DataCompareTableResult, kind: DiffKind) {
 function setDiffSelection(kind: DiffKind, selected: boolean) {
   if (executionLocked.value) return;
   batchResults.value.forEach((table) => {
+    if (!table.syncEligible) return;
     table.diff[kind].forEach((row) => {
       row.selected = selected;
     });
@@ -841,7 +842,7 @@ function setDiffSelection(kind: DiffKind, selected: boolean) {
 }
 
 function setTableDiffSelection(table: DataCompareTableResult, kind: DiffKind, selected: boolean) {
-  if (executionLocked.value) return;
+  if (executionLocked.value || !table.syncEligible) return;
   table.diff[kind].forEach((row) => {
     row.selected = selected;
   });
@@ -860,8 +861,8 @@ function clearAllSelections() {
   rebuildSyncPlan().catch((e) => toast(String(e), 5000));
 }
 
-function toggleRowSelection(row: SelectableDataCompareRow | SelectableDataCompareModifiedRow) {
-  if (executionLocked.value) return;
+function toggleRowSelection(table: DataCompareTableResult, row: SelectableDataCompareRow | SelectableDataCompareModifiedRow) {
+  if (executionLocked.value || !table.syncEligible) return;
   row.selected = !row.selected;
   rebuildSyncPlan().catch((e) => toast(String(e), 5000));
 }
@@ -1631,10 +1632,10 @@ onBeforeUnmount(() => {
                       <span class="font-medium">{{ t(`diff.${kind}`) }}</span>
                       <span class="text-muted-foreground">{{ selectedRows(item, kind) }}/{{ item.diff[kind].length }}</span>
                       <span class="flex-1" />
-                      <Button size="sm" variant="ghost" class="h-6 px-2 text-xs" @click="setTableDiffSelection(item, kind, true)">
+                      <Button size="sm" variant="ghost" class="h-6 px-2 text-xs" :disabled="!item.syncEligible" @click="setTableDiffSelection(item, kind, true)">
                         {{ t("dataCompare.selectAllKind", { kind: t(`diff.${kind}`) }) }}
                       </Button>
-                      <Button size="sm" variant="ghost" class="h-6 px-2 text-xs" @click="setTableDiffSelection(item, kind, false)">
+                      <Button size="sm" variant="ghost" class="h-6 px-2 text-xs" :disabled="!item.syncEligible" @click="setTableDiffSelection(item, kind, false)">
                         {{ t("dataCompare.clearKind", { kind: t(`diff.${kind}`) }) }}
                       </Button>
                       <Button v-if="item.diff[kind].length > detailPreviewLimitNumber" size="sm" variant="ghost" class="h-6 px-2 text-xs" @click="toggleShowAll(item, kind)">
@@ -1643,7 +1644,14 @@ onBeforeUnmount(() => {
                     </div>
 
                     <div class="max-h-72 overflow-auto divide-y">
-                      <button v-for="row in rowsForDisplay(item, kind)" :key="`${item.sourceTable}:${kind}:${row.key}`" type="button" class="flex w-full items-start gap-3 px-3 py-2 text-left text-xs hover:bg-muted/40" @click="toggleRowSelection(row)">
+                      <button
+                        v-for="row in rowsForDisplay(item, kind)"
+                        :key="`${item.sourceTable}:${kind}:${row.key}`"
+                        type="button"
+                        class="flex w-full items-start gap-3 px-3 py-2 text-left text-xs hover:bg-muted/40 disabled:cursor-not-allowed disabled:opacity-60"
+                        :disabled="!item.syncEligible"
+                        @click="toggleRowSelection(item, row)"
+                      >
                         <CheckSquare v-if="row.selected" class="mt-0.5 h-3.5 w-3.5 shrink-0 text-primary" />
                         <Square v-else class="mt-0.5 h-3.5 w-3.5 shrink-0 text-muted-foreground/40" />
                         <div class="min-w-0 flex-1">
diff --git a/apps/desktop/src/components/diff/__tests__/DataCompareDialog.keyColumns.spec.ts b/apps/desktop/src/components/diff/__tests__/DataCompareDialog.keyColumns.spec.ts
index 6f7ab5ee13..144ed4c824 100644
--- a/apps/desktop/src/components/diff/__tests__/DataCompareDialog.keyColumns.spec.ts
+++ b/apps/desktop/src/components/diff/__tests__/DataCompareDialog.keyColumns.spec.ts
@@ -206,6 +206,7 @@ function preparationFor(table: string) {
     sourceTruncated: false,
     targetTruncated: false,
     rowBudget: 100_000,
+    syncEligible: true,
   };
 }
 
diff --git a/apps/desktop/src/components/diff/__tests__/DataCompareDialog.prefill.spec.ts b/apps/desktop/src/components/diff/__tests__/DataCompareDialog.prefill.spec.ts
index 8e0ec5b345..0fd2b2d8a8 100644
--- a/apps/desktop/src/components/diff/__tests__/DataCompareDialog.prefill.spec.ts
+++ b/apps/desktop/src/components/diff/__tests__/DataCompareDialog.prefill.spec.ts
@@ -130,6 +130,7 @@ function completedSession(): DataCompareSession {
         sourceTruncated: false,
         targetTruncated: false,
         rowBudget: 100_000,
+        syncEligible: true,
         databaseType: "oracle",
         diff: {
           added: [
diff --git a/apps/desktop/src/composables/__tests__/useDataCompareSession.spec.ts b/apps/desktop/src/composables/__tests__/useDataCompareSession.spec.ts
index 604123a11d..845fdfe7ad 100644
--- a/apps/desktop/src/composables/__tests__/useDataCompareSession.spec.ts
+++ b/apps/desktop/src/composables/__tests__/useDataCompareSession.spec.ts
@@ -20,7 +20,7 @@ vi.mock("@/lib/backend/api", () => apiMock);
 vi.mock("@/composables/useDialogSources", () => ({ openDataCompareSession: openMock }));
 vi.mock("@/composables/useExportTracker", () => ({ useExportTracker: () => trackerMock }));
 
-const { normalizeKeyColumnOverrides, startDataCompareSession } = await import("../useDataCompareSession.ts");
+const { buildDataCompareSyncPlanTables, normalizeKeyColumnOverrides, startDataCompareSession } = await import("../useDataCompareSession.ts");
 
 function column(name: string, isPrimaryKey = false): ColumnInfo {
   return { name, data_type: "TEXT", is_nullable: true, column_default: null, is_primary_key: isPrimaryKey, extra: null };
@@ -45,6 +45,7 @@ function preparationFor(table: string) {
     sourceTruncated: false,
     targetTruncated: false,
     rowBudget: 100_000,
+    syncEligible: true,
   };
 }
 
@@ -228,13 +229,16 @@ test("keeps the configured per-table match columns after cloning the session con
 });
 
 test("carries the row budget and truncation flags from the backend into the table result", async () => {
-  apiMock.prepareDataCompareFromTables.mockImplementation((options: { targetTable: string }) => Promise.resolve({ ...preparationFor(options.targetTable), sourceRowCount: 4_000_000, sourceTruncated: true, targetTruncated: true, rowBudget: 100_000 }));
+  apiMock.prepareDataCompareFromTables.mockImplementation((options: { targetTable: string }) => Promise.resolve({ ...preparationFor(options.targetTable), sourceRowCount: 4_000_000, sourceTruncated: true, targetTruncated: true, rowBudget: 100_000, syncEligible: false }));
 
   const session = await runSession(baseConfig({ selectedSourceTables: ["users"], targetTable: "users" }), [{ sourceTable: "users", targetTable: "users" }]);
 
   assert.equal(session.batchResults[0]?.rowBudget, 100_000);
   assert.equal(session.batchResults[0]?.sourceTruncated, true);
   assert.equal(session.batchResults[0]?.targetTruncated, true);
+  assert.equal(session.batchResults[0]?.syncEligible, false);
+  assert.equal(buildDataCompareSyncPlanTables(session.batchResults, "public").length, 0);
+  assert.equal(session.batchResults[0]?.diff.added[0]?.selected, false);
 });
 
 test("keeps a truncated missing-target table on the same row budget", async () => {
@@ -243,12 +247,14 @@ test("keeps a truncated missing-target table on the same row budget", async () =
     sourceRowCount: 8_000_000,
     sourceTruncated: true,
     rowBudget: 100_000,
+    syncEligible: false,
   });
 
   const session = await runSession(baseConfig({ selectedSourceTables: ["users"], targetTable: "users", targetTables: ["orders"] }), [{ sourceTable: "users", targetTable: "users" }]);
 
   assert.equal(session.batchResults[0]?.rowBudget, 100_000);
   assert.equal(session.batchResults[0]?.sourceTruncated, true);
+  assert.equal(buildDataCompareSyncPlanTables(session.batchResults, "public").length, 0);
 });
 
 test("normalizes a per-table match-column map", () => {
diff --git a/apps/desktop/src/composables/useDataCompareSession.ts b/apps/desktop/src/composables/useDataCompareSession.ts
index 848cd00019..29247fc84f 100644
--- a/apps/desktop/src/composables/useDataCompareSession.ts
+++ b/apps/desktop/src/composables/useDataCompareSession.ts
@@ -59,8 +59,9 @@ export interface DataCompareTableResult {
   targetRowCount: number;
   sourceTruncated: boolean;
   targetTruncated: boolean;
-  /** Rows the backend was allowed to read per side; the diff only covers this many rows when a side is truncated. */
+  /** Rows the backend was allowed to inspect per side; incomplete results are never synchronization-eligible. */
   rowBudget: number;
+  syncEligible: boolean;
   databaseType?: DatabaseType;
   preSyncStatements?: string[];
   diff: SelectableDataCompareResult;
@@ -179,17 +180,17 @@ function compareErrorMessage(dependencies: DataCompareSessionDependencies, kind:
   return dependencies.formatError?.(kind, columns) ?? fallbackCompareErrorMessage(kind, columns);
 }
 
-function toSelectableDiff(diff: DataCompareResult): SelectableDataCompareResult {
+function toSelectableDiff(diff: DataCompareResult, selected: boolean): SelectableDataCompareResult {
   return {
-    added: diff.added.map((row) => ({ ...row, selected: true })),
-    removed: diff.removed.map((row) => ({ ...row, selected: true })),
-    modified: diff.modified.map((row) => ({ ...row, selected: true })),
+    added: diff.added.map((row) => ({ ...row, selected })),
+    removed: diff.removed.map((row) => ({ ...row, selected })),
+    modified: diff.modified.map((row) => ({ ...row, selected })),
   };
 }
 
 export function buildDataCompareSyncPlanTables(results: DataCompareTableResult[], targetSchema: string): DataCompareSyncPlanTableOptions[] {
   return results
-    .filter((table) => table.status === "different")
+    .filter((table) => table.status === "different" && table.syncEligible)
     .map((table) => ({
       tableName: table.targetTable,
       schema: targetSchema,
@@ -203,6 +204,7 @@ export function buildDataCompareSyncPlanTables(results: DataCompareTableResult[]
       },
       databaseType: table.databaseType,
       preSyncStatements: table.preSyncStatements ?? [],
+      syncEligible: true,
     }))
     .filter((table) => table.preSyncStatements.length > 0 || table.diff.added.length > 0 || table.diff.removed.length > 0 || table.diff.modified.length > 0);
 }
@@ -267,9 +269,10 @@ function buildTableResult(task: DataCompareTableTask, preparation: DataCompareFr
     sourceTruncated: preparation.sourceTruncated,
     targetTruncated: preparation.targetTruncated,
     rowBudget: preparation.rowBudget,
+    syncEligible: preparation.syncEligible,
     databaseType,
     preSyncStatements: preparation.preSyncStatements,
-    diff: toSelectableDiff(preparation.result),
+    diff: toSelectableDiff(preparation.result, preparation.syncEligible),
     expanded: status === "different",
     showAll: { added: false, removed: false, modified: false },
   };
@@ -291,9 +294,10 @@ function buildMissingTargetResult(task: DataCompareTableTask, preparation: DataC
     sourceTruncated: preparation.sourceTruncated,
     targetTruncated: false,
     rowBudget: preparation.rowBudget,
+    syncEligible: preparation.syncEligible,
     databaseType,
     preSyncStatements: preparation.preSyncStatements,
-    diff: toSelectableDiff(preparation.result),
+    diff: toSelectableDiff(preparation.result, preparation.syncEligible),
     expanded: preparation.result.added.length > 0,
     showAll: { added: false, removed: false, modified: false },
   };
@@ -315,6 +319,7 @@ function buildErrorResult(task: DataCompareTableTask, keyColumns: string[], data
     sourceTruncated: false,
     targetTruncated: false,
     rowBudget: 0,
+    syncEligible: false,
     databaseType,
     preSyncStatements: [],
     diff: { added: [], removed: [], modified: [] },
diff --git a/apps/desktop/src/i18n/locales/en.ts b/apps/desktop/src/i18n/locales/en.ts
index 3c536e2bf0..ff96b9ee97 100644
--- a/apps/desktop/src/i18n/locales/en.ts
+++ b/apps/desktop/src/i18n/locales/en.ts
@@ -8223,9 +8223,9 @@ export default {
     noDifferences: "Data is identical, no sync SQL needed",
     syncSuccess: "Data sync executed successfully",
     truncatedTitle: "Some tables were not compared in full",
-    truncatedHint: "Tables with more rows than a single compare can read were compared only over their first rows, so added, modified, or deleted rows beyond that point are not reported. Narrow the range with a filter and compare in batches.",
+    truncatedHint: "Tables above the single-compare limit were inspected only over a subset, so changes outside it are not reported. Synchronization SQL is disabled for these results; narrow the range and run complete comparisons in batches.",
     truncatedTable: "{table}: {source} source rows, {target} target rows, compared the first {budget} rows only",
-    truncatedBadge: "Compared the first {budget} rows only",
+    truncatedBadge: "Inspected a subset (up to {budget} rows per side); synchronization disabled",
   },
   settings: {
     historyRetentionLimit: "Query history retention",
diff --git a/apps/desktop/src/i18n/locales/zh-CN.ts b/apps/desktop/src/i18n/locales/zh-CN.ts
index e69fed7574..3f84402379 100644
--- a/apps/desktop/src/i18n/locales/zh-CN.ts
+++ b/apps/desktop/src/i18n/locales/zh-CN.ts
@@ -8206,9 +8206,9 @@ export default withEnglishFallback({
     noDifferences: "数据完全一致，无需生成同步 SQL",
     syncSuccess: "数据同步执行成功",
     truncatedTitle: "部分表未完整比较",
-    truncatedHint: "行数超过单次比较上限的表只比较了前若干行，超出部分的新增、修改和删除不会被发现。建议加上过滤条件缩小范围后分批比较。",
+    truncatedHint: "行数超过单次比较上限的表只检查了部分数据，未检查范围内的新增、修改和删除不会被发现，因此不会生成或执行同步 SQL。建议缩小范围后分批完整比较。",
     truncatedTable: "{table}：源 {source} 行、目标 {target} 行，仅比较前 {budget} 行",
-    truncatedBadge: "仅比较前 {budget} 行",
+    truncatedBadge: "仅检查部分数据（单侧上限 {budget} 行），同步已禁用",
   },
   settings: {
     historyRetentionLimit: "查询历史保留条数",
diff --git a/apps/desktop/src/lib/__tests__/database/databaseDriverManifest.spec.ts b/apps/desktop/src/lib/__tests__/database/databaseDriverManifest.spec.ts
index d43ed4a3c3..c98c971afd 100644
--- a/apps/desktop/src/lib/__tests__/database/databaseDriverManifest.spec.ts
+++ b/apps/desktop/src/lib/__tests__/database/databaseDriverManifest.spec.ts
@@ -1,5 +1,16 @@
 import { describe, expect, it } from "vitest";
-import { databaseConnectionFormKind, databaseDefaultPort, databaseManifestEntry, databaseProductCapabilities, databaseRuntimeMode, supportsDatabaseFeature, usesAgentCursorForQuery, usesAgentCursorForTableData } from "@/lib/database/databaseDriverManifest";
+import {
+  databaseConnectionFormKind,
+  databaseDefaultPort,
+  databaseManifestEntry,
+  databaseProductCapabilities,
+  databaseRuntimeMode,
+  databaseTransferSupportLevel,
+  supportsDatabaseCompareMode,
+  supportsDatabaseFeature,
+  usesAgentCursorForQuery,
+  usesAgentCursorForTableData,
+} from "@/lib/database/databaseDriverManifest";
 
 describe("databaseDriverManifest", () => {
   it("advertises implemented Xugu capabilities without enabling unsupported features", () => {
@@ -61,6 +72,20 @@ describe("databaseDriverManifest", () => {
     });
   });
 
+  it("exposes transfer compatibility evidence from the shared manifest", () => {
+    expect(databaseTransferSupportLevel("mysql")).toBe("verified");
+    expect(databaseTransferSupportLevel("kingbase")).toBe("family-compatible");
+    expect(databaseTransferSupportLevel("db2")).toBe("best-effort");
+    expect(databaseTransferSupportLevel("gbase")).toBeUndefined();
+  });
+
+  it("exposes schema and data comparison support from the shared manifest", () => {
+    expect(supportsDatabaseCompareMode("mysql", "schema")).toBe(true);
+    expect(supportsDatabaseCompareMode("kingbase", "data")).toBe(true);
+    expect(supportsDatabaseCompareMode("mongodb", "data")).toBe(false);
+    expect(supportsDatabaseCompareMode("redis", "schema")).toBe(false);
+  });
+
   it("offers only the supported NebulaGraph 3.x profile", () => {
     expect(databaseManifestEntry("nebula")?.driverProfiles).toEqual([{ profile: "nebula-v3", agentKey: "nebula", label: "NebulaGraph 3.x", storeVisible: false }]);
   });
diff --git a/apps/desktop/src/lib/dataGrid/dataCompare.ts b/apps/desktop/src/lib/dataGrid/dataCompare.ts
index 08fb0c017c..e8f54dc5b4 100644
--- a/apps/desktop/src/lib/dataGrid/dataCompare.ts
+++ b/apps/desktop/src/lib/dataGrid/dataCompare.ts
@@ -95,8 +95,9 @@ export interface DataCompareFromTablesPreparation extends DataComparePreparation
   targetRowCount: number;
   sourceTruncated: boolean;
   targetTruncated: boolean;
-  /** Rows per side this compare was allowed to read; fewer than `sourceRowCount`/`targetRowCount` when truncated. */
+  /** Rows per side this compare was allowed to inspect; fewer than the full table when truncated or sampled. */
   rowBudget: number;
+  syncEligible: boolean;
 }
 
 export interface DataCompareSyncPlanTableOptions {
@@ -108,6 +109,7 @@ export interface DataCompareSyncPlanTableOptions {
   diff: DataCompareResult;
   databaseType?: DatabaseType;
   preSyncStatements?: string[];
+  syncEligible: boolean;
 }
 
 export interface DataCompareSyncPlanOptions {
diff --git a/apps/desktop/src/lib/database/__tests__/databaseCompareCapabilities.spec.ts b/apps/desktop/src/lib/database/__tests__/databaseCompareCapabilities.spec.ts
new file mode 100644
index 0000000000..89d059ba9a
--- /dev/null
+++ b/apps/desktop/src/lib/database/__tests__/databaseCompareCapabilities.spec.ts
@@ -0,0 +1,16 @@
+import { describe, expect, it } from "vitest";
+import { supportsDatabaseCompare } from "@/lib/database/databaseCompareCapabilities";
+
+describe("databaseCompareCapabilities", () => {
+  it("reads comparison support from the shared driver manifest", () => {
+    expect(supportsDatabaseCompare({ db_type: "mysql" }, "schema")).toBe(true);
+    expect(supportsDatabaseCompare({ db_type: "kingbase" }, "data")).toBe(true);
+    expect(supportsDatabaseCompare({ db_type: "mongodb" }, "data")).toBe(false);
+    expect(supportsDatabaseCompare({ db_type: "redis" }, "schema")).toBe(false);
+  });
+
+  it("applies manifest support after resolving a JDBC product dialect", () => {
+    expect(supportsDatabaseCompare({ db_type: "jdbc", connection_string: "jdbc:postgresql://localhost:5432/app" }, "data")).toBe(true);
+    expect(supportsDatabaseCompare({ db_type: "jdbc", driver_profile: "unknown-product" }, "data")).toBe(false);
+  });
+});
diff --git a/apps/desktop/src/lib/database/databaseCompareCapabilities.ts b/apps/desktop/src/lib/database/databaseCompareCapabilities.ts
index 8e5ed12a40..4a0b5efff1 100644
--- a/apps/desktop/src/lib/database/databaseCompareCapabilities.ts
+++ b/apps/desktop/src/lib/database/databaseCompareCapabilities.ts
@@ -1,84 +1,14 @@
-import type { ConnectionConfig, DatabaseType } from "@/types/database";
+import type { ConnectionConfig } from "@/types/database";
 import { CONNECTION_PROFILES, type ConnectionProfileDefinition } from "@/types/generated/connectionProfiles";
-import { databaseManifestEntry } from "@/lib/database/databaseDriverManifest";
+import { databaseManifestEntry, supportsDatabaseCompareMode, type DatabaseCompareMode } from "@/lib/database/databaseDriverManifest";
 import { effectiveDatabaseTypeForConnection } from "@/lib/database/jdbcDialect";
 
-export type DatabaseCompareMode = "schema" | "data";
-
-// Comparison loads relational metadata and, for data, generates COUNT/SELECT
-// statements. Unknown providers must opt in here rather than pass a blacklist.
-const SQL_COMPARE_TYPES = new Set<DatabaseType>([
-  "mysql",
-  "postgres",
-  "sqlite",
-  "rqlite",
-  "turso",
-  "cloudflare-d1",
-  "duckdb",
-  "clickhouse",
-  "sqlserver",
-  "oracle",
-  "doris",
-  "starrocks",
-  "manticoresearch",
-  "redshift",
-  "dameng",
-  "kingbase",
-  "highgo",
-  "uxdb",
-  "vastbase",
-  "goldendb",
-  "databend",
-  "gaussdb",
-  "kwdb",
-  "yashandb",
-  "databricks",
-  "saphana",
-  "teradata",
-  "vertica",
-  "firebird",
-  "exasol",
-  "opengauss",
-  "questdb",
-  "oceanbase-oracle",
-  "gbase",
-  "access",
-  "h2",
-  "snowflake",
-  "trino",
-  "prestosql",
-  "hive",
-  "argo",
-  "transwarp",
-  "kyuubi",
-  "impala",
-  "db2",
-  "informix",
-  "bigquery",
-  "spanner",
-  "kylin",
-  "ignite",
-  "ignite3",
-  "sundb",
-  "oscar",
-  "tdengine",
-  "xugu",
-  "iotdb",
-  "iris",
-  "influxdb3",
-  "spark",
-]);
+export type { DatabaseCompareMode } from "@/lib/database/databaseDriverManifest";
 
 export function supportsDatabaseCompare(connection: ConnectionConfig | undefined, mode: DatabaseCompareMode): boolean {
   if (!connection) return false;
   const type = effectiveDatabaseTypeForConnection(connection);
-  // Keep the two paths explicit: a future driver may support metadata compare
-  // without supporting the generated data comparison SQL (or vice versa).
-  switch (mode) {
-    case "schema":
-    case "data":
-      return !!type && SQL_COMPARE_TYPES.has(type);
-  }
+  return supportsDatabaseCompareMode(type, mode);
 }
 
 const profiles: Readonly<Record<string, ConnectionProfileDefinition>> = CONNECTION_PROFILES;
diff --git a/apps/desktop/src/lib/database/databaseDriverManifest.ts b/apps/desktop/src/lib/database/databaseDriverManifest.ts
index a9f6a12c1f..d70ff57bc7 100644
--- a/apps/desktop/src/lib/database/databaseDriverManifest.ts
+++ b/apps/desktop/src/lib/database/databaseDriverManifest.ts
@@ -3,6 +3,9 @@ import driverManifest from "../../../../../crates/dbx-core/assets/database-drive
 
 export type DatabaseSupportLevel = "connect" | "browse" | "understand" | "operate";
 export type DatabaseRuntimeMode = "native" | "file" | "agent" | "external";
+export type DatabaseTransferObjectFamily = "mysql" | "postgres" | "oracle" | "sqlserver";
+export type DatabaseTransferSupportLevel = "verified" | "family-compatible" | "best-effort";
+export type DatabaseCompareMode = "schema" | "data";
 export type ConnectionFormKind = "standard" | "jdbc" | "mq" | "mqtt" | "nacos";
 
 export const DATABASE_PRODUCT_CAPABILITY_KEYS = [
@@ -50,6 +53,9 @@ export interface ManagedDatabaseDriver {
 
 export interface DatabaseDriverManifestEntry {
   dbType: DatabaseType;
+  compareModes?: DatabaseCompareMode[];
+  transferObjectFamily?: DatabaseTransferObjectFamily;
+  transferSupportLevel?: DatabaseTransferSupportLevel;
   label: string;
   dialect?: string;
   runtimeMode: DatabaseRuntimeMode;
@@ -140,6 +146,18 @@ export function databaseRuntimeMode(dbType?: DatabaseType): DatabaseRuntimeMode
   return dbType ? DATABASE_DRIVER_BY_TYPE.get(dbType)?.runtimeMode : undefined;
 }
 
+export function databaseTransferObjectFamily(dbType?: DatabaseType): DatabaseTransferObjectFamily | undefined {
+  return dbType ? DATABASE_DRIVER_BY_TYPE.get(dbType)?.transferObjectFamily : undefined;
+}
+
+export function databaseTransferSupportLevel(dbType?: DatabaseType): DatabaseTransferSupportLevel | undefined {
+  return dbType ? DATABASE_DRIVER_BY_TYPE.get(dbType)?.transferSupportLevel : undefined;
+}
+
+export function supportsDatabaseCompareMode(dbType: DatabaseType | undefined, mode: DatabaseCompareMode): boolean {
+  return dbType ? DATABASE_DRIVER_BY_TYPE.get(dbType)?.compareModes?.includes(mode) === true : false;
+}
+
 export function databaseProductCapabilities(dbType?: DatabaseType): DatabaseProductCapabilities {
   if (!dbType) return DEFAULT_CAPABILITIES;
   return (DATABASE_DRIVER_BY_TYPE.get(dbType)?.capabilities ?? DEFAULT_CAPABILITIES) as DatabaseProductCapabilities;
diff --git a/apps/desktop/src/lib/database/transferObjectKinds.ts b/apps/desktop/src/lib/database/transferObjectKinds.ts
index fc3c71b25c..cd7d3cddd7 100644
--- a/apps/desktop/src/lib/database/transferObjectKinds.ts
+++ b/apps/desktop/src/lib/database/transferObjectKinds.ts
@@ -1,5 +1,6 @@
 import type { DatabaseType } from "@/types/database";
 import { supportsTransfer } from "@/lib/database/databaseFeatureSupport";
+import { databaseTransferObjectFamily } from "@/lib/database/databaseDriverManifest";
 
 export enum TransferObjectFamily {
   Mysql = "mysql",
@@ -15,22 +16,8 @@ const POSTGRES_KINDS: TransferObjectKind[] = ["TABLE", "VIEW", "MATERIALIZED_VIE
 const ORACLE_KINDS: TransferObjectKind[] = ["TABLE", "VIEW", "MATERIALIZED_VIEW", "PROCEDURE", "FUNCTION", "TRIGGER", "SEQUENCE"];
 const SQLSERVER_KINDS: TransferObjectKind[] = ["TABLE", "VIEW", "PROCEDURE", "FUNCTION", "TRIGGER", "SEQUENCE"];
 
-const FAMILY_BY_DB = new Map<DatabaseType, TransferObjectFamily>([
-  ["mysql", TransferObjectFamily.Mysql],
-  ["gbase", TransferObjectFamily.Mysql],
-  ["postgres", TransferObjectFamily.Postgres],
-  ["kingbase", TransferObjectFamily.Postgres],
-  ["gaussdb", TransferObjectFamily.Postgres],
-  ["kwdb", TransferObjectFamily.Postgres],
-  ["opengauss", TransferObjectFamily.Postgres],
-  ["oracle", TransferObjectFamily.Oracle],
-  ["dameng", TransferObjectFamily.Oracle],
-  ["oceanbase-oracle", TransferObjectFamily.Oracle],
-  ["sqlserver", TransferObjectFamily.SqlServer],
-]);
-
 export function transferObjectFamily(dbType?: DatabaseType): TransferObjectFamily | undefined {
-  return dbType ? FAMILY_BY_DB.get(dbType) : undefined;
+  return databaseTransferObjectFamily(dbType) as TransferObjectFamily | undefined;
 }
 
 export function isSameTransferFamily(a?: DatabaseType, b?: DatabaseType): boolean {
diff --git a/crates/dbx-core/assets/database-drivers.manifest.json b/crates/dbx-core/assets/database-drivers.manifest.json
index e516d12a17..34e7373491 100644
--- a/crates/dbx-core/assets/database-drivers.manifest.json
+++ b/crates/dbx-core/assets/database-drivers.manifest.json
@@ -3,6 +3,12 @@
   "drivers": [
     {
       "dbType": "mysql",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "verified",
+      "transferObjectFamily": "mysql",
       "label": "MySQL",
       "dialect": "MySQL",
       "runtimeMode": "native",
@@ -36,6 +42,12 @@
     },
     {
       "dbType": "postgres",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "verified",
+      "transferObjectFamily": "postgres",
       "label": "PostgreSQL",
       "dialect": "PostgreSQL",
       "runtimeMode": "native",
@@ -73,6 +85,11 @@
     },
     {
       "dbType": "sqlite",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "verified",
       "label": "SQLite",
       "dialect": "SQLite",
       "runtimeMode": "file",
@@ -114,6 +131,11 @@
     },
     {
       "dbType": "rqlite",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "RQLite",
       "dialect": "Rqlite",
       "runtimeMode": "native",
@@ -147,6 +169,11 @@
     },
     {
       "dbType": "turso",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "Turso",
       "dialect": "Turso",
       "runtimeMode": "native",
@@ -180,6 +207,11 @@
     },
     {
       "dbType": "cloudflare-d1",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "Cloudflare D1",
       "dialect": "SQLite",
       "runtimeMode": "native",
@@ -242,6 +274,11 @@
     },
     {
       "dbType": "duckdb",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "DuckDB",
       "dialect": "DuckDB",
       "runtimeMode": "file",
@@ -284,6 +321,11 @@
     },
     {
       "dbType": "clickhouse",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "ClickHouse",
       "dialect": "ClickHouse",
       "runtimeMode": "native",
@@ -314,6 +356,12 @@
     },
     {
       "dbType": "sqlserver",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "verified",
+      "transferObjectFamily": "sqlserver",
       "label": "SQL Server",
       "dialect": "SQL Server",
       "runtimeMode": "native",
@@ -359,6 +407,7 @@
     },
     {
       "dbType": "mongodb",
+      "transferSupportLevel": "best-effort",
       "label": "MongoDB (Legacy)",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -428,6 +477,12 @@
     },
     {
       "dbType": "oracle",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "verified",
+      "transferObjectFamily": "oracle",
       "label": "Oracle",
       "dialect": "Oracle",
       "runtimeMode": "agent",
@@ -779,6 +834,10 @@
     },
     {
       "dbType": "doris",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Doris",
       "dialect": "Doris",
       "runtimeMode": "native",
@@ -809,6 +868,10 @@
     },
     {
       "dbType": "starrocks",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "StarRocks",
       "dialect": "StarRocks",
       "runtimeMode": "native",
@@ -839,6 +902,10 @@
     },
     {
       "dbType": "manticoresearch",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Manticore Search",
       "dialect": "ManticoreSearch",
       "runtimeMode": "native",
@@ -869,6 +936,10 @@
     },
     {
       "dbType": "redshift",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Redshift",
       "dialect": "Redshift",
       "runtimeMode": "native",
@@ -905,6 +976,12 @@
     },
     {
       "dbType": "dameng",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "family-compatible",
+      "transferObjectFamily": "oracle",
       "label": "达梦 DM8",
       "dialect": "Dameng",
       "runtimeMode": "agent",
@@ -945,6 +1022,12 @@
     },
     {
       "dbType": "kingbase",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "family-compatible",
+      "transferObjectFamily": "postgres",
       "label": "金仓KingbaseES",
       "dialect": "Kingbase",
       "runtimeMode": "agent",
@@ -983,6 +1066,11 @@
     },
     {
       "dbType": "highgo",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "瀚高 HighGo",
       "dialect": "HighGo",
       "runtimeMode": "agent",
@@ -1021,6 +1109,10 @@
     },
     {
       "dbType": "uxdb",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "优炫 UXDB",
       "dialect": "PostgreSQL",
       "runtimeMode": "agent",
@@ -1059,6 +1151,11 @@
     },
     {
       "dbType": "vastbase",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "海量 Vastbase",
       "dialect": "Vastbase",
       "runtimeMode": "agent",
@@ -1097,6 +1194,11 @@
     },
     {
       "dbType": "goldendb",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "金篆 GoldenDB",
       "dialect": "GoldenDB",
       "runtimeMode": "agent",
@@ -1130,6 +1232,10 @@
     },
     {
       "dbType": "databend",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Databend",
       "dialect": "Databend",
       "runtimeMode": "agent",
@@ -1166,6 +1272,12 @@
     },
     {
       "dbType": "gaussdb",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "family-compatible",
+      "transferObjectFamily": "postgres",
       "label": "GaussDB",
       "dialect": "GaussDB",
       "runtimeMode": "native",
@@ -1204,6 +1316,12 @@
     },
     {
       "dbType": "kwdb",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "family-compatible",
+      "transferObjectFamily": "postgres",
       "label": "KWDB",
       "dialect": "KwDB",
       "runtimeMode": "native",
@@ -1241,6 +1359,11 @@
     },
     {
       "dbType": "yashandb",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "崖山 YashanDB",
       "dialect": "YashanDB",
       "runtimeMode": "agent",
@@ -1278,6 +1401,10 @@
     },
     {
       "dbType": "databricks",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Databricks SQL",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -1314,6 +1441,10 @@
     },
     {
       "dbType": "saphana",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "SAP HANA",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -1350,6 +1481,10 @@
     },
     {
       "dbType": "teradata",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Teradata",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -1386,6 +1521,10 @@
     },
     {
       "dbType": "vertica",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Vertica",
       "dialect": "Vertica",
       "runtimeMode": "agent",
@@ -1423,6 +1562,10 @@
     },
     {
       "dbType": "firebird",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Firebird",
       "dialect": "Firebird",
       "runtimeMode": "agent",
@@ -1459,6 +1602,10 @@
     },
     {
       "dbType": "exasol",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Exasol",
       "dialect": "Exasol",
       "runtimeMode": "agent",
@@ -1496,6 +1643,12 @@
     },
     {
       "dbType": "opengauss",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "family-compatible",
+      "transferObjectFamily": "postgres",
       "label": "openGauss",
       "dialect": "openGauss",
       "runtimeMode": "native",
@@ -1533,6 +1686,11 @@
     },
     {
       "dbType": "questdb",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "QuestDB",
       "dialect": "QuestDB",
       "runtimeMode": "native",
@@ -1568,6 +1726,12 @@
     },
     {
       "dbType": "oceanbase-oracle",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "family-compatible",
+      "transferObjectFamily": "oracle",
       "label": "OceanBase Oracle Mode",
       "dialect": "OceanBase",
       "runtimeMode": "agent",
@@ -1608,6 +1772,11 @@
     },
     {
       "dbType": "gbase",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferObjectFamily": "mysql",
       "label": "南大通用 GBase 8a",
       "dialect": "GBase",
       "runtimeMode": "agent",
@@ -1661,6 +1830,10 @@
     },
     {
       "dbType": "access",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Microsoft Access",
       "dialect": "Access",
       "runtimeMode": "agent",
@@ -1697,6 +1870,11 @@
     },
     {
       "dbType": "h2",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "H2",
       "dialect": "H2",
       "runtimeMode": "agent",
@@ -1768,6 +1946,10 @@
     },
     {
       "dbType": "snowflake",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Snowflake",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -1805,6 +1987,10 @@
     },
     {
       "dbType": "trino",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Trino",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -1842,6 +2028,10 @@
     },
     {
       "dbType": "prestosql",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "PrestoSQL",
       "runtimeMode": "external",
       "mcpMode": "bridge",
@@ -1876,6 +2066,11 @@
     },
     {
       "dbType": "hive",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "Apache Hive",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -1911,6 +2106,11 @@
     },
     {
       "dbType": "argo",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "星环Argo",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -1946,6 +2146,11 @@
     },
     {
       "dbType": "transwarp",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "星环Inceptor",
       "dialect": "Transwarp",
       "runtimeMode": "agent",
@@ -1990,6 +2195,11 @@
     },
     {
       "dbType": "kyuubi",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "Apache Kyuubi",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2024,6 +2234,11 @@
     },
     {
       "dbType": "impala",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "Apache Impala",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2058,6 +2273,11 @@
     },
     {
       "dbType": "db2",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "IBM DB2",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2094,6 +2314,10 @@
     },
     {
       "dbType": "informix",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "IBM Informix",
       "dialect": "Informix",
       "runtimeMode": "agent",
@@ -2235,6 +2459,10 @@
     },
     {
       "dbType": "bigquery",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Google BigQuery",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2266,6 +2494,10 @@
     },
     {
       "dbType": "spanner",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Google Cloud Spanner",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2302,6 +2534,10 @@
     },
     {
       "dbType": "kylin",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Apache Kylin",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2334,6 +2570,10 @@
     },
     {
       "dbType": "ignite",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Apache Ignite",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2370,6 +2610,10 @@
     },
     {
       "dbType": "ignite3",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Apache Ignite 3",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2406,6 +2650,10 @@
     },
     {
       "dbType": "sundb",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "科蓝 SUNDB",
       "dialect": "SunDB",
       "runtimeMode": "agent",
@@ -2443,6 +2691,10 @@
     },
     {
       "dbType": "oscar",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "神通 OSCAR",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2479,6 +2731,10 @@
     },
     {
       "dbType": "tdengine",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "TDengine",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2511,6 +2767,11 @@
     },
     {
       "dbType": "xugu",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "虚谷 XuguDB",
       "dialect": "Xugu",
       "runtimeMode": "agent",
@@ -2766,6 +3027,10 @@
     },
     {
       "dbType": "iotdb",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "Apache IoTDB",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
@@ -2801,6 +3066,11 @@
     },
     {
       "dbType": "iris",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "InterSystems IRIS",
       "dialect": "Iris",
       "runtimeMode": "agent",
@@ -2878,6 +3148,10 @@
     },
     {
       "dbType": "influxdb3",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
       "label": "InfluxDB 3.x",
       "runtimeMode": "native",
       "mcpMode": "bridge",
@@ -2973,6 +3247,11 @@
     },
     {
       "dbType": "spark",
+      "compareModes": [
+        "schema",
+        "data"
+      ],
+      "transferSupportLevel": "best-effort",
       "label": "Apache Spark",
       "runtimeMode": "agent",
       "mcpMode": "bridge",
diff --git a/crates/dbx-core/src/data/correction.rs b/crates/dbx-core/src/data/correction.rs
index c03b7f313c..036dccc7db 100644
--- a/crates/dbx-core/src/data/correction.rs
+++ b/crates/dbx-core/src/data/correction.rs
@@ -513,6 +513,7 @@ mod tests {
             source_truncated: false,
             target_truncated: false,
             row_budget: 100_000,
+            sync_eligible: true,
             degradation_level: Some("full".to_string()),
             sampling_rate: Some(1.0),
             confidence_score: Some(1.0),
diff --git a/crates/dbx-core/src/data/data_compare.rs b/crates/dbx-core/src/data/data_compare.rs
index a7705927a8..d7e34e68c2 100644
--- a/crates/dbx-core/src/data/data_compare.rs
+++ b/crates/dbx-core/src/data/data_compare.rs
@@ -11,11 +11,13 @@ use crate::models::connection::DatabaseType;
 use crate::query::{execute_sql_statement_with_options, QueryExecutionOptions};
 use crate::schema::get_columns_core;
 use crate::sql_dialect::{
-    build_count_table_sql, firebird_rows_clause, pagination_strategy, qualified_table_name, quote_table_identifier,
-    PaginationContext, TablePaginationStrategy,
+    build_count_table_sql, build_iris_table_select_sql, firebird_rows_clause, pagination_strategy,
+    qualified_table_name, quote_table_identifier, PaginationContext, TablePaginationStrategy,
 };
 use crate::transfer::{generate_comment_ddl, generate_create_table_ddl};
 
+use super::sample_pairing::retain_shared_sample_rows_by_key;
+
 const DATA_SYNC_INSERT_BATCH_SIZE: usize = 500;
 const DATA_SYNC_CONDITION_BATCH_SIZE: usize = 200;
 
@@ -149,6 +151,8 @@ pub struct DataCompareSyncPlanTableOptions {
     pub database_type: Option<DatabaseType>,
     #[serde(default, skip_serializing_if = "Vec::is_empty")]
     pub pre_sync_statements: Vec<String>,
+    #[serde(default)]
+    pub sync_eligible: bool,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -182,11 +186,13 @@ pub struct DataCompareFromTablesPreparation {
     pub source_truncated: bool,
     pub target_truncated: bool,
     /// Rows per side this compare was allowed to read. When a side holds more rows than
-    /// this, the diff only covers the first `row_budget` rows and the matching
-    /// `*_truncated` flag is set, so the UI can warn instead of showing a partial plan
-    /// as if it were complete.
+    /// this, the diff covers only a bounded subset and the matching `*_truncated`
+    /// flag is set. `sync_eligible` remains false so a partial result cannot become
+    /// executable synchronization SQL.
     #[serde(default)]
     pub row_budget: usize,
+    #[serde(default)]
+    pub sync_eligible: bool,
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub degradation_level: Option<String>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
@@ -331,6 +337,8 @@ pub async fn prepare_data_compare_from_tables(
 ) -> Result<DataCompareFromTablesPreparation, String> {
     let source_database_type = connection_database_type(state, &options.source_connection_id).await?;
     let target_database_type = connection_database_type(state, &options.target_connection_id).await?;
+    ensure_data_compare_supported(source_database_type, "source")?;
+    ensure_data_compare_supported(target_database_type, "target")?;
     let fetch_batch_size = options.fetch_batch_size.unwrap_or(1000).max(1);
 
     let source_count_sql =
@@ -435,14 +443,24 @@ pub async fn prepare_data_compare_from_tables(
                         threshold.sample_size,
                     )
                 )?;
+                let column_indexes = column_index_map(&options.columns);
+                let (src, tgt) = retain_shared_sample_rows_by_key(src, tgt, |row| {
+                    key_for_row(row, &options.key_columns, &column_indexes)
+                });
                 let max_count = source_row_count.max(target_row_count);
                 let sample_rate = if max_count > 0 { threshold.sample_size as f64 / max_count as f64 } else { 1.0 };
-                let method = "sampled".to_string();
-                (src, tgt, sample_rate.min(1.0), method, false, false)
+                let method = "paired_key_sample".to_string();
+                let source_truncated = source_row_count > src.len() as u64;
+                let target_truncated = target_row_count > tgt.len() as u64;
+                (src, tgt, sample_rate.min(1.0), method, source_truncated, target_truncated)
+            }
+            DegradationLevel::SkipWithRisk => {
+                (Vec::new(), Vec::new(), 0.0, "skipped".to_string(), source_row_count > 0, target_row_count > 0)
             }
-            DegradationLevel::SkipWithRisk => (Vec::new(), Vec::new(), 0.0, "skipped".to_string(), false, false),
         };
 
+    let sync_eligible = matches!(degradation_level, DegradationLevel::Full) && !source_truncated && !target_truncated;
+
     let target_columns = get_columns_core(
         state,
         &options.target_connection_id,
@@ -478,16 +496,20 @@ pub async fn prepare_data_compare_from_tables(
         database_type: Some(target_database_type),
     })?;
 
+    let (sync_statements, sync_sql) =
+        if sync_eligible { (preparation.sync_statements, preparation.sync_sql) } else { (Vec::new(), String::new()) };
+
     Ok(DataCompareFromTablesPreparation {
         result: preparation.result,
-        sync_statements: preparation.sync_statements,
-        sync_sql: preparation.sync_sql,
+        sync_statements,
+        sync_sql,
         pre_sync_statements: Vec::new(),
         source_row_count,
         target_row_count,
         source_truncated,
         target_truncated,
         row_budget,
+        sync_eligible,
         degradation_level: Some(degradation_level.to_string()),
         sampling_rate: Some(sampling_rate),
         confidence_score: Some(confidence_score),
@@ -503,6 +525,8 @@ pub async fn prepare_data_compare_missing_target(
 ) -> Result<DataCompareFromTablesPreparation, String> {
     let source_database_type = connection_database_type(state, &options.source_connection_id).await?;
     let target_database_type = connection_database_type(state, &options.target_connection_id).await?;
+    ensure_data_compare_supported(source_database_type, "source")?;
+    ensure_data_compare_supported(target_database_type, "target")?;
     let fetch_batch_size = options.fetch_batch_size.unwrap_or(1000).max(1);
     let source_columns = get_columns_core(
         state,
@@ -546,6 +570,7 @@ pub async fn prepare_data_compare_missing_target(
     )
     .await?;
     let source_truncated = source_row_count > row_budget as u64;
+    let sync_eligible = !source_truncated;
     let result = missing_target_diff(&column_names, &options.key_columns, source_rows);
     let mut pre_sync_statements = Vec::new();
     pre_sync_statements.push(format!(
@@ -587,14 +612,15 @@ pub async fn prepare_data_compare_missing_target(
 
     Ok(DataCompareFromTablesPreparation {
         result,
-        sync_statements: sync_plan.sync_statements,
-        sync_sql: sync_plan.sync_sql,
+        sync_statements: if sync_eligible { sync_plan.sync_statements } else { Vec::new() },
+        sync_sql: if sync_eligible { sync_plan.sync_sql } else { String::new() },
         pre_sync_statements,
         source_row_count,
         target_row_count: 0,
         source_truncated,
         target_truncated: false,
         row_budget,
+        sync_eligible,
         degradation_level: Some(should_degrade(source_row_count, 0, &threshold).to_string()),
         sampling_rate: Some(if source_truncated { row_budget as f64 / source_row_count.max(1) as f64 } else { 1.0 }),
         confidence_score: Some(if source_truncated { 0.5 } else { 1.0 }),
@@ -610,6 +636,7 @@ pub fn build_data_compare_sync_plan(options: DataCompareSyncPlanOptions) -> Data
     let tables = options
         .tables
         .iter()
+        .filter(|table| table.sync_eligible)
         .map(|table| DataCompareSyncPlanTableRef {
             table_name: &table.table_name,
             schema: table.schema.as_deref(),
@@ -1069,6 +1096,16 @@ async fn connection_database_type(state: &AppState, connection_id: &str) -> Resu
         .ok_or_else(|| format!("Connection config not found: {connection_id}"))
 }
 
+fn ensure_data_compare_supported(database_type: DatabaseType, endpoint: &str) -> Result<(), String> {
+    if dbx_types::database_manifest::supports_compare_mode(
+        &database_type,
+        dbx_types::database_manifest::DatabaseCompareMode::Data,
+    ) {
+        return Ok(());
+    }
+    Err(format!("{endpoint} database {} does not support data comparison", database_type.as_str()))
+}
+
 fn first_count(rows: &[Vec<Value>]) -> Result<u64, String> {
     let value = rows.first().and_then(|row| row.first()).ok_or_else(|| "COUNT query returned no rows".to_string())?;
     match value {
@@ -1164,7 +1201,9 @@ fn build_data_compare_select_sql(
                 "WITH {page_alias} AS (SELECT {select_columns}, ROW_NUMBER() OVER (ORDER BY {order_expression}) AS {row_number_alias} FROM {table}) SELECT {select_columns} FROM {page_alias} WHERE {row_number_alias} > {offset} AND {row_number_alias} <= {end} ORDER BY {row_number_alias}"
             )
         }
-        TablePaginationStrategy::IrisTop => format!("SELECT TOP {row_limit} {select_columns} FROM {table}{order_by}"),
+        TablePaginationStrategy::IrisTop => {
+            build_iris_table_select_sql(&select_columns, &table, "", &order_by, row_limit, offset as u64)
+        }
         TablePaginationStrategy::InformixFirst => {
             let row_limit_clause =
                 if offset > 0 { format!("SKIP {offset} FIRST {row_limit}") } else { format!("FIRST {row_limit}") };
@@ -1991,6 +2030,7 @@ mod tests {
                 },
                 database_type: Some(DatabaseType::Postgres),
                 pre_sync_statements: Vec::new(),
+                sync_eligible: true,
             }],
         });
 
@@ -2038,6 +2078,7 @@ mod tests {
                 },
                 database_type: Some(DatabaseType::Postgres),
                 pre_sync_statements: Vec::new(),
+                sync_eligible: true,
             }],
         });
 
@@ -2090,6 +2131,7 @@ mod tests {
                 diff: DataCompareResult { added: Vec::new(), removed: Vec::new(), modified },
                 database_type: Some(DatabaseType::Postgres),
                 pre_sync_statements: Vec::new(),
+                sync_eligible: true,
             }],
         });
 
@@ -2174,6 +2216,7 @@ mod tests {
                 },
                 database_type: Some(DatabaseType::Postgres),
                 pre_sync_statements: Vec::new(),
+                sync_eligible: true,
             }],
         });
 
@@ -2183,6 +2226,35 @@ mod tests {
         assert_eq!(plan.statement_count, 2);
     }
 
+    #[test]
+    fn incomplete_comparisons_cannot_build_sync_statements() {
+        let plan = build_data_compare_sync_plan(DataCompareSyncPlanOptions {
+            tables: vec![DataCompareSyncPlanTableOptions {
+                table_name: "users".to_string(),
+                schema: Some("public".to_string()),
+                columns: vec!["id".to_string()],
+                key_columns: vec!["id".to_string()],
+                column_info: Vec::new(),
+                diff: DataCompareResult {
+                    added: vec![DataCompareRow {
+                        key: "1".to_string(),
+                        key_values: HashMap::from([(String::from("id"), json!(1))]),
+                        values: HashMap::from([(String::from("id"), json!(1))]),
+                    }],
+                    removed: Vec::new(),
+                    modified: Vec::new(),
+                },
+                database_type: Some(DatabaseType::Postgres),
+                pre_sync_statements: Vec::new(),
+                sync_eligible: false,
+            }],
+        });
+
+        assert_eq!(plan.statement_count, 0);
+        assert!(plan.sync_statements.is_empty());
+        assert!(plan.sync_sql.is_empty());
+    }
+
     #[test]
     fn batches_added_rows_into_multi_value_insert_statements() {
         let plan = build_data_compare_sync_plan(DataCompareSyncPlanOptions {
@@ -2216,6 +2288,7 @@ mod tests {
                 },
                 database_type: Some(DatabaseType::Postgres),
                 pre_sync_statements: Vec::new(),
+                sync_eligible: true,
             }],
         });
 
@@ -2270,6 +2343,7 @@ mod tests {
                 },
                 database_type: Some(DatabaseType::Mysql),
                 pre_sync_statements: Vec::new(),
+                sync_eligible: true,
             }],
         });
 
@@ -2308,6 +2382,7 @@ mod tests {
                 },
                 database_type: Some(DatabaseType::Postgres),
                 pre_sync_statements: Vec::new(),
+                sync_eligible: true,
             }],
         });
 
@@ -2356,6 +2431,7 @@ mod tests {
                 diff: diff.clone(),
                 database_type: Some(DatabaseType::Postgres),
                 pre_sync_statements: pre_sync_statements.clone(),
+                sync_eligible: true,
             }],
         });
         let borrowed_plan = build_data_compare_sync_plan_from_refs(&[DataCompareSyncPlanTableRef {
@@ -2397,6 +2473,7 @@ mod tests {
                 },
                 database_type: Some(DatabaseType::Postgres),
                 pre_sync_statements: vec!["CREATE TABLE \"public\".\"users\" (\"id\" integer);".to_string()],
+                sync_eligible: true,
             }],
         });
 
@@ -2440,6 +2517,7 @@ mod tests {
                 pre_sync_statements: vec![
                     "CREATE TABLE \"public\".\"generated_column_sync_test\" (\"id\" bigint);".to_string()
                 ],
+                sync_eligible: true,
             }],
         });
 
@@ -2874,6 +2952,22 @@ mod tests {
         );
     }
 
+    #[test]
+    fn builds_backend_table_select_sql_for_iris_offset_pages() {
+        assert_eq!(
+            build_data_compare_select_sql(
+                DatabaseType::Iris,
+                "APP",
+                "USERS",
+                &["ID".to_string(), "NAME".to_string()],
+                &["ID".to_string()],
+                25,
+                50,
+            ),
+            "SELECT * FROM (SELECT TOP 75 ID, NAME FROM APP.USERS ORDER BY ID ASC) WHERE %VID > 50"
+        );
+    }
+
     #[test]
     fn builds_backend_table_select_sql_for_oceanbase_oracle_rownum_pages() {
         assert_eq!(
diff --git a/crates/dbx-core/src/data/mod.rs b/crates/dbx-core/src/data/mod.rs
index f1dc15e6c2..cf9ca1fd8b 100644
--- a/crates/dbx-core/src/data/mod.rs
+++ b/crates/dbx-core/src/data/mod.rs
@@ -10,6 +10,7 @@ pub mod grid_clipboard_guard;
 pub mod mongodb_dump;
 pub mod mongodb_import_export;
 pub mod query_result_export;
+mod sample_pairing;
 pub mod script_generator;
 pub mod sql_file_import;
 pub mod sqlite_backup;
@@ -17,3 +18,4 @@ pub mod table_export;
 pub mod table_import;
 pub mod transfer;
 pub mod transfer_rebuild;
+pub mod transfer_runner;
diff --git a/crates/dbx-core/src/data/sample_pairing.rs b/crates/dbx-core/src/data/sample_pairing.rs
new file mode 100644
index 0000000000..2a538fe8da
--- /dev/null
+++ b/crates/dbx-core/src/data/sample_pairing.rs
@@ -0,0 +1,18 @@
+use std::collections::HashSet;
+use std::hash::Hash;
+
+pub(super) fn retain_shared_sample_rows_by_key<Row, Key, KeyFn>(
+    source_rows: Vec<Row>,
+    target_rows: Vec<Row>,
+    key_for_row: KeyFn,
+) -> (Vec<Row>, Vec<Row>)
+where
+    Key: Eq + Hash,
+    KeyFn: Fn(&Row) -> Key,
+{
+    let source_keys = source_rows.iter().map(&key_for_row).collect::<HashSet<_>>();
+    let target_keys = target_rows.iter().map(&key_for_row).collect::<HashSet<_>>();
+    let source_rows = source_rows.into_iter().filter(|row| target_keys.contains(&key_for_row(row))).collect();
+    let target_rows = target_rows.into_iter().filter(|row| source_keys.contains(&key_for_row(row))).collect();
+    (source_rows, target_rows)
+}
diff --git a/crates/dbx-core/src/data/transfer.rs b/crates/dbx-core/src/data/transfer.rs
index 720aed59ef..978d2ef305 100644
--- a/crates/dbx-core/src/data/transfer.rs
+++ b/crates/dbx-core/src/data/transfer.rs
@@ -224,28 +224,15 @@ pub struct TransferObjectSelection {
     pub names: Vec<String>,
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum TransferObjectFamily {
-    Mysql,
-    Postgres,
-    Oracle,
-    SqlServer,
-}
+pub use dbx_types::database_manifest::DatabaseTransferObjectFamily as TransferObjectFamily;
+pub use dbx_types::database_manifest::DatabaseTransferSupportLevel as TransferSupportLevel;
 
 pub fn transfer_object_family(db_type: &DatabaseType) -> Option<TransferObjectFamily> {
-    match db_type {
-        DatabaseType::Mysql | DatabaseType::Gbase => Some(TransferObjectFamily::Mysql),
-        DatabaseType::Postgres
-        | DatabaseType::Kingbase
-        | DatabaseType::Gaussdb
-        | DatabaseType::Kwdb
-        | DatabaseType::OpenGauss => Some(TransferObjectFamily::Postgres),
-        DatabaseType::Oracle | DatabaseType::Dameng | DatabaseType::OceanbaseOracle => {
-            Some(TransferObjectFamily::Oracle)
-        }
-        DatabaseType::SqlServer => Some(TransferObjectFamily::SqlServer),
-        _ => None,
-    }
+    dbx_types::database_manifest::transfer_object_family(db_type)
+}
+
+pub fn transfer_support_level(db_type: &DatabaseType) -> Option<TransferSupportLevel> {
+    dbx_types::database_manifest::transfer_support_level(db_type)
 }
 
 pub fn is_same_transfer_family(a: &DatabaseType, b: &DatabaseType) -> bool {
@@ -1045,6 +1032,12 @@ pub fn validate_transfer_database_pair(
     source_db_type: &DatabaseType,
     target_db_type: &DatabaseType,
 ) -> Result<(), String> {
+    if transfer_support_level(source_db_type).is_none() {
+        return Err(format!("{} 暂未声明数据传输兼容级别", source_db_type.as_str()));
+    }
+    if transfer_support_level(target_db_type).is_none() {
+        return Err(format!("{} 暂未声明数据传输兼容级别", target_db_type.as_str()));
+    }
     if !matches!(source_db_type, DatabaseType::Xugu) && !matches!(target_db_type, DatabaseType::Xugu) {
         return Ok(());
     }
@@ -14368,6 +14361,14 @@ CREATE TABLE "Other"."prefix""Source"."NAME" ("ID" INT);"#;
             assert!(validate_transfer_database_pair(&rebuild, &DatabaseType::Xugu, &DatabaseType::Xugu).is_err());
         }
 
+        #[test]
+        fn transfer_pair_requires_declared_endpoint_compatibility() {
+            let request = base_request();
+            let error = validate_transfer_database_pair(&request, &DatabaseType::Gbase, &DatabaseType::Mysql)
+                .expect_err("GBase data transfer is disabled in the shared manifest");
+            assert!(error.contains("gbase"));
+        }
+
         #[test]
         fn xugu_structure_transfer_rejects_renamed_tables_and_non_table_objects() {
             let request = TransferRequest { target_table_name_case: TransferTableNameCase::Upper, ..base_request() };
diff --git a/crates/dbx-core/src/data/transfer_runner.rs b/crates/dbx-core/src/data/transfer_runner.rs
new file mode 100644
index 0000000000..e412648840
--- /dev/null
+++ b/crates/dbx-core/src/data/transfer_runner.rs
@@ -0,0 +1,694 @@
+use std::sync::{Arc, Mutex};
+
+use crate::{
+    connection::AppState,
+    models::connection::DatabaseType,
+    persistence::task_history::{TaskItemStatus, TransferTaskJournal},
+};
+
+use super::transfer::{TransferProgress, TransferRequest, TransferStatus};
+
+struct ProgressEmitter<F> {
+    callback: Mutex<F>,
+    terminal: Mutex<Option<TransferProgress>>,
+}
+
+impl<F> ProgressEmitter<F>
+where
+    F: FnMut(TransferProgress) + Send,
+{
+    fn new(callback: F) -> Self {
+        Self { callback: Mutex::new(callback), terminal: Mutex::new(None) }
+    }
+
+    fn emit(&self, progress: TransferProgress) {
+        (self.callback.lock().unwrap_or_else(std::sync::PoisonError::into_inner))(progress);
+    }
+
+    fn emit_terminal(&self, progress: TransferProgress) {
+        *self.terminal.lock().unwrap_or_else(std::sync::PoisonError::into_inner) = Some(progress);
+    }
+
+    fn take_terminal(&self, transfer_id: &str, total_tables: usize) -> TransferProgress {
+        self.terminal.lock().unwrap_or_else(std::sync::PoisonError::into_inner).take().unwrap_or_else(|| {
+            TransferProgress {
+                transfer_id: transfer_id.to_string(),
+                table: String::new(),
+                table_index: total_tables,
+                total_tables,
+                rows_transferred: 0,
+                total_rows: None,
+                status: TransferStatus::Error,
+                error: Some("Transfer ended without a terminal result".to_string()),
+                terminal: true,
+            }
+        })
+    }
+}
+
+fn emit_progress<F>(emitter: &ProgressEmitter<F>, progress: TransferProgress)
+where
+    F: FnMut(TransferProgress) + Send,
+{
+    emitter.emit(progress);
+}
+
+async fn emit_terminal_progress<F>(
+    emitter: &ProgressEmitter<F>,
+    _history: Option<&TransferTaskJournal>,
+    progress: TransferProgress,
+) where
+    F: FnMut(TransferProgress) + Send,
+{
+    emitter.emit_terminal(progress);
+}
+
+#[allow(clippy::too_many_arguments)]
+pub async fn run_transfer<F>(
+    state: Arc<AppState>,
+    request: TransferRequest,
+    source_db_type: DatabaseType,
+    target_db_type: DatabaseType,
+    source_pool_key: String,
+    target_pool_key: String,
+    history: Option<TransferTaskJournal>,
+    progress_callback: F,
+) -> TransferProgress
+where
+    F: FnMut(TransferProgress) + Send,
+{
+    let transfer_id = request.transfer_id.clone();
+    let total_tables = request.tables.len();
+    let app = ProgressEmitter::new(progress_callback);
+
+    async {
+        // Sort tables by FK dependency so referenced tables are transferred first,
+        // and keep the foreign key metadata fetched along the way — MySQL-family
+        // targets reuse it per table below instead of re-querying it.
+        // Skip for external Doris/StarRocks catalogs — the database name does not
+        // exist in the default catalog and sorting is unnecessary (no FK constraints).
+        let (sorted_tables, known_foreign_keys) = {
+            let skip_fk_sort = {
+                let configs = state.configs.read().await;
+                configs
+                    .get(&request.source_connection_id)
+                    .and_then(|config| {
+                        super::transfer::resolve_external_transfer_catalog_for_config(
+                            request.source_catalog.as_deref(),
+                            config,
+                        )
+                    })
+                    .is_some()
+            };
+            if skip_fk_sort {
+                (request.tables.clone(), std::collections::HashMap::new())
+            } else {
+                super::transfer::sort_tables_by_fk_dependency_with_foreign_keys(
+                    &state,
+                    &request.source_connection_id,
+                    &request.source_database,
+                    &request.source_schema,
+                    &request.tables,
+                    true,
+                )
+                .await
+                .unwrap_or_else(|e| {
+                    log::warn!("[transfer] failed to sort tables by FK dependency, using original order: {e}");
+                    (request.tables.clone(), std::collections::HashMap::new())
+                })
+            }
+        };
+
+        let total_tables = sorted_tables.len();
+        log::info!("[transfer] starting transfer_id={} tables={}", transfer_id, total_tables);
+
+        let mut failed_tables: Vec<String> = Vec::new();
+        let mut pending_fk_alters: Vec<(String, String)> = Vec::new();
+        let mut last_rows_transferred = 0_u64;
+        let mut last_total_rows = None;
+
+        // When drop_target_before_create is true, perform a rename pre-pass in
+        // parents_first=false order (children first) so that foreign keys on the
+        // backup tables remain intact. The main create/insert pass then runs in
+        // parents_first=true order (parents first).
+        // Children-first order used by the rename pre-pass, kept for the post-loop backup
+        // cleanup: a backup can still be referenced by another backup, so the drops must
+        // follow the same order.
+        let mut backup_drop_order: Vec<String> = Vec::new();
+        let backup_names = if request.drop_target_before_create {
+            // Re-sort tables in children-first order for the rename pre-pass
+            let (tables_for_rename, _) = super::transfer::sort_tables_by_fk_dependency_with_foreign_keys(
+                &state,
+                &request.target_connection_id,
+                &request.target_database,
+                &request.target_schema,
+                &sorted_tables,
+                false, // parents_first=false: children first
+            )
+            .await
+            .unwrap_or_else(|e| {
+                log::warn!("[transfer] failed to sort tables for rename pre-pass, using original order: {e}");
+                (sorted_tables.clone(), std::collections::HashMap::new())
+            });
+            backup_drop_order = tables_for_rename.clone();
+
+            match super::transfer::rename_tables_to_backup(
+                &state,
+                &request,
+                &tables_for_rename,
+                target_db_type,
+                &target_pool_key,
+                |progress| {
+                    last_rows_transferred = progress.rows_transferred;
+                    last_total_rows = progress.total_rows;
+                    emit_progress(&app, progress);
+                },
+            )
+            .await
+            {
+                Ok(names) => Some(names),
+                Err(e) if e == "Cancelled" => {
+                    emit_terminal_progress(
+                        &app,
+                        history.as_ref(),
+                        TransferProgress {
+                            transfer_id: transfer_id.clone(),
+                            table: "rename pre-pass".to_string(),
+                            table_index: 0,
+                            total_tables,
+                            rows_transferred: last_rows_transferred,
+                            total_rows: last_total_rows,
+                            status: TransferStatus::Cancelled,
+                            error: None,
+                            terminal: true,
+                        },
+                    )
+                    .await;
+                    super::transfer::clear_cancelled(&transfer_id).await;
+                    return;
+                }
+                Err(e) => {
+                    emit_terminal_progress(
+                        &app,
+                        history.as_ref(),
+                        TransferProgress {
+                            transfer_id: transfer_id.clone(),
+                            table: "rename pre-pass".to_string(),
+                            table_index: 0,
+                            total_tables,
+                            rows_transferred: last_rows_transferred,
+                            total_rows: last_total_rows,
+                            status: TransferStatus::Error,
+                            error: Some(e),
+                            terminal: true,
+                        },
+                    )
+                    .await;
+                    super::transfer::clear_cancelled(&transfer_id).await;
+                    return;
+                }
+            }
+        } else {
+            None
+        };
+
+        if matches!(source_db_type, DatabaseType::Postgres) && matches!(target_db_type, DatabaseType::Postgres) {
+            match super::transfer::transfer_postgres_schema_dependencies(
+                &state,
+                &request,
+                &source_pool_key,
+                &target_pool_key,
+                |progress| {
+                    last_rows_transferred = progress.rows_transferred;
+                    last_total_rows = progress.total_rows;
+                    emit_progress(&app, progress);
+                },
+            )
+            .await
+            {
+                Ok(()) => {}
+                Err(e) if e == "Cancelled" => {
+                    emit_terminal_progress(
+                        &app,
+                        history.as_ref(),
+                        TransferProgress {
+                            transfer_id: transfer_id.clone(),
+                            table: "schema dependencies".to_string(),
+                            table_index: 0,
+                            total_tables,
+                            rows_transferred: last_rows_transferred,
+                            total_rows: last_total_rows,
+                            status: TransferStatus::Cancelled,
+                            error: None,
+                            terminal: true,
+                        },
+                    )
+                    .await;
+                    super::transfer::clear_cancelled(&transfer_id).await;
+                    return;
+                }
+                Err(e) => {
+                    emit_terminal_progress(
+                        &app,
+                        history.as_ref(),
+                        TransferProgress {
+                            transfer_id: transfer_id.clone(),
+                            table: "schema dependencies".to_string(),
+                            table_index: 0,
+                            total_tables,
+                            rows_transferred: last_rows_transferred,
+                            total_rows: last_total_rows,
+                            status: TransferStatus::Error,
+                            error: Some(e),
+                            terminal: true,
+                        },
+                    )
+                    .await;
+                    super::transfer::clear_cancelled(&transfer_id).await;
+                    return;
+                }
+            }
+        }
+        // Overwrite clears each target right before copying it, parents first, which cannot
+        // clear a table another selected table references. Empty those children first now.
+        let overwrite_cleared = match super::transfer::clear_foreign_key_linked_overwrite_targets(
+            &state,
+            &request,
+            &sorted_tables,
+            target_db_type,
+            &target_pool_key,
+        )
+        .await
+        {
+            Ok(cleared) => cleared,
+            Err(e) => {
+                emit_terminal_progress(
+                    &app,
+                    history.as_ref(),
+                    TransferProgress {
+                        transfer_id: transfer_id.clone(),
+                        table: "overwrite pre-pass".to_string(),
+                        table_index: 0,
+                        total_tables,
+                        rows_transferred: last_rows_transferred,
+                        total_rows: last_total_rows,
+                        status: TransferStatus::Error,
+                        error: Some(e),
+                        terminal: true,
+                    },
+                )
+                .await;
+                super::transfer::clear_cancelled(&transfer_id).await;
+                return;
+            }
+        };
+
+        for (i, table) in sorted_tables.iter().enumerate() {
+            if super::transfer::is_cancelled(&transfer_id).await {
+                emit_terminal_progress(
+                    &app,
+                    history.as_ref(),
+                    TransferProgress {
+                        transfer_id: transfer_id.clone(),
+                        table: table.clone(),
+                        table_index: i,
+                        total_tables,
+                        rows_transferred: last_rows_transferred,
+                        total_rows: last_total_rows,
+                        status: TransferStatus::Cancelled,
+                        error: None,
+                        terminal: true,
+                    },
+                )
+                .await;
+                super::transfer::clear_cancelled(&transfer_id).await;
+                return;
+            }
+
+            log::info!("[transfer] table {}/{}: {}", i + 1, total_tables, table);
+            let history_item_index =
+                history.as_ref().and_then(|journal| journal.item_index_for_table(table)).unwrap_or(i);
+            if let Some(journal) = history.as_ref() {
+                journal.start_table(history_item_index).await;
+            }
+            let mut source_row_count = None;
+            let mut moved_row_count = None;
+            let history_for_progress = history.as_ref();
+            let history_for_count = history.as_ref();
+            let result = super::transfer::transfer_table_with_result(
+                &state,
+                &request,
+                table,
+                i,
+                &source_db_type,
+                &target_db_type,
+                &source_pool_key,
+                &target_pool_key,
+                &known_foreign_keys,
+                &mut pending_fk_alters,
+                backup_names.as_ref(),
+                overwrite_cleared.contains(table),
+                |progress| {
+                    last_rows_transferred = progress.rows_transferred;
+                    last_total_rows = progress.total_rows;
+                    moved_row_count = Some(progress.rows_transferred);
+                    if let Some(journal) = history_for_progress {
+                        journal.observe_table_progress(history_item_index, progress.rows_transferred);
+                    }
+                    emit_progress(&app, progress);
+                },
+                |source_count| {
+                    source_row_count = source_count;
+                    if let Some(journal) = history_for_count {
+                        journal.observe_source_count(history_item_index, source_count);
+                    }
+                },
+            )
+            .await;
+            match result {
+                Ok(result) => {
+                    if let Some(journal) = history.as_ref() {
+                        journal
+                            .finish_table(
+                                history_item_index,
+                                TaskItemStatus::Succeeded,
+                                result.source_row_count,
+                                Some(result.moved_rows),
+                            )
+                            .await;
+                    }
+                    emit_progress(
+                        &app,
+                        TransferProgress {
+                            transfer_id: transfer_id.clone(),
+                            table: table.clone(),
+                            table_index: i,
+                            total_tables,
+                            rows_transferred: result.moved_rows,
+                            total_rows: last_total_rows.or(Some(result.moved_rows)),
+                            status: TransferStatus::TableDone,
+                            error: None,
+                            terminal: false,
+                        },
+                    );
+                }
+                Err(e) => {
+                    if e == "Cancelled" {
+                        if let Some(journal) = history.as_ref() {
+                            journal
+                                .finish_table(
+                                    history_item_index,
+                                    TaskItemStatus::Cancelled,
+                                    source_row_count,
+                                    moved_row_count,
+                                )
+                                .await;
+                        }
+                        emit_terminal_progress(
+                            &app,
+                            history.as_ref(),
+                            TransferProgress {
+                                transfer_id: transfer_id.clone(),
+                                table: table.clone(),
+                                table_index: i,
+                                total_tables,
+                                rows_transferred: 0,
+                                total_rows: None,
+                                status: TransferStatus::Cancelled,
+                                error: None,
+                                terminal: true,
+                            },
+                        )
+                        .await;
+                        super::transfer::clear_cancelled(&transfer_id).await;
+                        return;
+                    }
+                    if let Some(journal) = history.as_ref() {
+                        journal
+                            .finish_table(history_item_index, TaskItemStatus::Failed, source_row_count, moved_row_count)
+                            .await;
+                    }
+                    failed_tables.push(table.clone());
+                    emit_progress(
+                        &app,
+                        TransferProgress {
+                            transfer_id: transfer_id.clone(),
+                            table: table.clone(),
+                            table_index: i,
+                            total_tables,
+                            rows_transferred: last_rows_transferred,
+                            total_rows: last_total_rows,
+                            status: TransferStatus::Error,
+                            error: Some(e),
+                            terminal: false,
+                        },
+                    );
+                }
+            }
+        }
+
+        // Add any foreign keys deferred during MySQL-family table creation now that
+        // every selected table exists — see transfer_table's use of
+        // strip_inline_foreign_key_constraint_lines for why these can't be created
+        // inline (a foreign key cycle has no valid CREATE TABLE order at all). The
+        // rename pre-pass already freed the backup constraint names, so these re-create
+        // the original names without colliding.
+        let mut failed_fk_tables: Vec<String> = Vec::new();
+        let mut failed_fk_count = 0usize;
+        for (table, alter_sql) in &pending_fk_alters {
+            if let Err(e) = super::transfer::execute_on_pool(&state, &target_pool_key, alter_sql).await {
+                log::warn!("[transfer] failed to add deferred foreign key constraint for {table}: {e}");
+                failed_fk_count += 1;
+                failed_fk_tables.push(table.clone());
+            }
+        }
+        if failed_fk_count > 0 {
+            failed_fk_tables.sort();
+            failed_fk_tables.dedup();
+            failed_tables.push(format!("{} foreign key(s) on: {}", failed_fk_count, failed_fk_tables.join(", ")));
+        }
+
+        // Transfer selected non-table objects (views, procedures, functions,
+        // triggers, sequences, events) after the per-table loop. The shared
+        // Core decision handles all content modes: DataOnly never
+        // transfers schema objects; PG→PG keeps the legacy empty-selection
+        // default only when structure participates in the transfer.
+        let mut object_outcome = super::transfer::TransferObjectOutcome::default();
+        match super::transfer::transfer_schema_objects(
+            &state,
+            &request,
+            &source_pool_key,
+            &target_pool_key,
+            |progress| emit_progress(&app, progress),
+        )
+        .await
+        {
+            Ok(outcome) => {
+                if let Some(journal) = history.as_ref() {
+                    journal.record_object_outcome(&outcome).await;
+                }
+                object_outcome = outcome;
+            }
+            Err(e) if e == "Cancelled" => {
+                if let Some(journal) = history.as_ref() {
+                    journal.record_schema_objects_error(true).await;
+                }
+                emit_terminal_progress(
+                    &app,
+                    history.as_ref(),
+                    TransferProgress {
+                        transfer_id: transfer_id.clone(),
+                        table: "schema objects".to_string(),
+                        table_index: total_tables,
+                        total_tables,
+                        rows_transferred: 0,
+                        total_rows: None,
+                        status: TransferStatus::Cancelled,
+                        error: None,
+                        terminal: true,
+                    },
+                )
+                .await;
+                super::transfer::clear_cancelled(&transfer_id).await;
+                return;
+            }
+            Err(e) => {
+                if let Some(journal) = history.as_ref() {
+                    journal.record_schema_objects_error(false).await;
+                }
+                failed_tables.push("schema objects".to_string());
+                emit_progress(
+                    &app,
+                    TransferProgress {
+                        transfer_id: transfer_id.clone(),
+                        table: "schema objects".to_string(),
+                        table_index: total_tables,
+                        total_tables,
+                        rows_transferred: 0,
+                        total_rows: None,
+                        status: TransferStatus::Error,
+                        error: Some(e),
+                        terminal: false,
+                    },
+                );
+            }
+        }
+        if !object_outcome.failed.is_empty() {
+            failed_tables.push(format!("schema objects ({})", object_outcome.failed.len()));
+        }
+
+        // The rename pre-pass left one backup per rebuilt table. Drop them only now that
+        // every table, every deferred foreign key and every selected schema object has
+        // succeeded — a failure anywhere above keeps the originals recoverable under
+        // their backup names.
+        if let Some(backup_names) = backup_names.as_ref() {
+            if failed_tables.is_empty() {
+                if let Err(e) = super::transfer::drop_backup_tables(
+                    &state,
+                    &request,
+                    target_db_type,
+                    &target_pool_key,
+                    backup_names,
+                    &backup_drop_order,
+                )
+                .await
+                {
+                    failed_tables.push(e);
+                }
+            } else {
+                log::warn!(
+                    "[transfer] keeping {} backup table(s) because {} step(s) failed",
+                    backup_names.len(),
+                    failed_tables.len()
+                );
+            }
+        }
+        let skip_suffix = if !object_outcome.skipped.is_empty() && failed_tables.is_empty() {
+            format!("，跳过 {} 个已存在对象", object_outcome.skipped.len())
+        } else if !object_outcome.skipped.is_empty() {
+            format!("；跳过 {} 个已存在对象", object_outcome.skipped.len())
+        } else {
+            String::new()
+        };
+
+        emit_terminal_progress(
+            &app,
+            history.as_ref(),
+            TransferProgress {
+                transfer_id: transfer_id.clone(),
+                table: String::new(),
+                table_index: total_tables,
+                total_tables,
+                rows_transferred: last_rows_transferred,
+                total_rows: last_total_rows,
+                status: if failed_tables.is_empty() { TransferStatus::Done } else { TransferStatus::Error },
+                error: if failed_tables.is_empty() {
+                    if skip_suffix.is_empty() {
+                        None
+                    } else {
+                        Some(skip_suffix.clone())
+                    }
+                } else {
+                    Some(format!(
+                        "{} table(s) failed: {}{}",
+                        failed_tables.len(),
+                        failed_tables.iter().take(5).cloned().collect::<Vec<_>>().join(", "),
+                        skip_suffix
+                    ))
+                },
+                terminal: true,
+            },
+        )
+        .await;
+        super::transfer::clear_cancelled(&transfer_id).await;
+    }
+    .await;
+
+    super::transfer::clear_cancelled(&transfer_id).await;
+    app.take_terminal(&transfer_id, total_tables)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::models::connection::ConnectionConfig;
+    use serde_json::json;
+
+    #[tokio::test]
+    async fn empty_data_only_transfer_completes_without_schema_object_progress() {
+        let directory = tempfile::tempdir().unwrap();
+        let storage = crate::persistence::test_storage::open(&directory.path().join("storage.db")).await.unwrap();
+        let state = Arc::new(AppState::new_with_plugin_dir(storage, directory.path().join("plugins")));
+
+        for id in ["source", "target"] {
+            let path = directory.path().join(format!("{id}.db"));
+            crate::db::sqlite::connect_path_create_if_missing(path.to_str().unwrap()).await.unwrap();
+            let config: ConnectionConfig = serde_json::from_value(json!({
+                "id": id,
+                "name": id,
+                "db_type": "sqlite",
+                "host": path.to_str().unwrap(),
+                "port": 0,
+                "username": "",
+                "password": "",
+                "database": null,
+                "one_time": false,
+                "save_password": false,
+                "read_only": false
+            }))
+            .unwrap();
+            state.configs.write().await.insert(id.to_string(), config);
+        }
+
+        let source_pool = super::super::transfer::ensure_transfer_pool(&state, "source", "main", None).await.unwrap();
+        let target_pool = super::super::transfer::ensure_transfer_pool(&state, "target", "main", None).await.unwrap();
+        let request: TransferRequest = serde_json::from_value(json!({
+            "transferId": uuid::Uuid::new_v4().to_string(),
+            "sourceConnectionId": "source",
+            "sourceDatabase": "main",
+            "sourceSchema": "main",
+            "targetConnectionId": "target",
+            "targetDatabase": "main",
+            "targetSchema": "main",
+            "tables": [],
+            "createTable": false,
+            "dropTargetBeforeCreate": false,
+            "dropTargetConfirmed": false,
+            "content": "dataOnly",
+            "objects": [],
+            "mode": "append",
+            "batchSize": 1000
+        }))
+        .unwrap();
+        let transfer_id = request.transfer_id.clone();
+        let observed = Arc::new(Mutex::new(Vec::new()));
+        let observed_for_callback = observed.clone();
+
+        let terminal = run_transfer(
+            state,
+            request,
+            DatabaseType::Sqlite,
+            DatabaseType::Sqlite,
+            source_pool,
+            target_pool,
+            None,
+            move |progress| {
+                observed_for_callback.lock().unwrap_or_else(std::sync::PoisonError::into_inner).push(progress);
+            },
+        )
+        .await;
+
+        assert!(matches!(terminal.status, TransferStatus::Done));
+        assert!(terminal.terminal);
+        assert!(terminal.error.is_none());
+        assert!(
+            observed
+                .lock()
+                .unwrap_or_else(std::sync::PoisonError::into_inner)
+                .iter()
+                .all(|progress| progress.table != "schema objects"),
+            "data-only no-op must not emit schema-object progress"
+        );
+        assert!(!super::super::transfer::is_cancelled(&transfer_id).await);
+    }
+}
diff --git a/crates/dbx-core/src/lib.rs b/crates/dbx-core/src/lib.rs
index c7701a4df0..944f7fee71 100644
--- a/crates/dbx-core/src/lib.rs
+++ b/crates/dbx-core/src/lib.rs
@@ -101,6 +101,7 @@ pub use data::table_export;
 pub use data::table_import;
 pub use data::transfer;
 pub use data::transfer_rebuild;
+pub use data::transfer_runner;
 pub use dbx_drivers::ssh_config;
 pub use dbx_formats::sql_file_zip_package;
 pub use dbx_formats::temporal_format;
diff --git a/crates/dbx-core/tests/regression_compatibility.rs b/crates/dbx-core/tests/regression_compatibility.rs
index 8b12038499..16afbd0dbc 100644
--- a/crates/dbx-core/tests/regression_compatibility.rs
+++ b/crates/dbx-core/tests/regression_compatibility.rs
@@ -1,4 +1,9 @@
-use dbx_core::data_compare::{DataCompareFromTablesPreparation, DataComparePreparation, DataCompareResult};
+use std::collections::HashMap;
+
+use dbx_core::data_compare::{
+    build_data_compare_sync_plan, DataCompareFromTablesPreparation, DataComparePreparation, DataCompareResult,
+    DataCompareRow, DataCompareSyncPlanOptions, DataCompareSyncPlanTableOptions,
+};
 use dbx_core::models::connection::DatabaseType;
 use dbx_core::schema_diff::{
     generate_schema_sync_sql, prepare_schema_diff, SchemaDiffPreparation, SchemaDiffPreparationOptions, TableDiff,
@@ -242,6 +247,7 @@ fn data_compare_from_tables_preparation_optional_fields_default() {
         source_truncated: false,
         target_truncated: false,
         row_budget: 100_000,
+        sync_eligible: true,
         degradation_level: None,
         sampling_rate: None,
         confidence_score: None,
@@ -257,6 +263,7 @@ fn data_compare_from_tables_preparation_optional_fields_default() {
     assert!(json.get("syncSql").is_some(), "syncSql must be present");
     // The row budget travels with the preparation so the UI can flag a partial compare.
     assert_eq!(json.get("rowBudget").and_then(|value| value.as_u64()), Some(100_000));
+    assert_eq!(json.get("syncEligible").and_then(|value| value.as_bool()), Some(true));
 
     // New optional fields should be absent when None
     assert!(json.get("degradationLevel").is_none(), "degradationLevel should be absent");
@@ -286,11 +293,41 @@ fn data_compare_from_tables_preparation_deserializes_old_format() {
 
     assert_eq!(prep.source_row_count, 100);
     assert_eq!(prep.target_row_count, 100);
+    assert!(!prep.sync_eligible, "legacy payloads without completeness evidence must fail closed");
     assert!(prep.degradation_level.is_none());
     assert!(prep.sampling_rate.is_none());
     assert!(prep.confidence_score.is_none());
 }
 
+#[test]
+fn incomplete_data_compare_cannot_generate_sync_sql() {
+    let plan = build_data_compare_sync_plan(DataCompareSyncPlanOptions {
+        tables: vec![DataCompareSyncPlanTableOptions {
+            table_name: "users".to_string(),
+            schema: Some("public".to_string()),
+            columns: vec!["id".to_string()],
+            key_columns: vec!["id".to_string()],
+            column_info: Vec::new(),
+            diff: DataCompareResult {
+                added: vec![DataCompareRow {
+                    key: "1".to_string(),
+                    key_values: HashMap::from([(String::from("id"), serde_json::json!(1))]),
+                    values: HashMap::from([(String::from("id"), serde_json::json!(1))]),
+                }],
+                removed: Vec::new(),
+                modified: Vec::new(),
+            },
+            database_type: Some(DatabaseType::Postgres),
+            pre_sync_statements: Vec::new(),
+            sync_eligible: false,
+        }],
+    });
+
+    assert_eq!(plan.statement_count, 0);
+    assert!(plan.sync_statements.is_empty());
+    assert!(plan.sync_sql.is_empty());
+}
+
 /// Verify that DataComparePreparation (the original struct) remains unchanged
 #[test]
 fn data_compare_preparation_format_stable() {
diff --git a/crates/dbx-core/tests/sample_pairing.rs b/crates/dbx-core/tests/sample_pairing.rs
new file mode 100644
index 0000000000..68e430e049
--- /dev/null
+++ b/crates/dbx-core/tests/sample_pairing.rs
@@ -0,0 +1,26 @@
+#[path = "../src/data/sample_pairing.rs"]
+mod sample_pairing;
+
+use sample_pairing::retain_shared_sample_rows_by_key;
+
+#[test]
+fn independently_sampled_rows_keep_only_shared_keys() {
+    let source = vec![(1, "source-only"), (2, "shared")];
+    let target = vec![(2, "shared"), (3, "target-only")];
+
+    let (source, target) = retain_shared_sample_rows_by_key(source, target, |row| row.0);
+
+    assert_eq!(source, vec![(2, "shared")]);
+    assert_eq!(target, vec![(2, "shared")]);
+}
+
+#[test]
+fn paired_samples_preserve_real_duplicate_keys() {
+    let source = vec![(1, "first"), (1, "duplicate")];
+    let target = vec![(1, "target")];
+
+    let (source, target) = retain_shared_sample_rows_by_key(source, target, |row| row.0);
+
+    assert_eq!(source, vec![(1, "first"), (1, "duplicate")]);
+    assert_eq!(target, vec![(1, "target")]);
+}
diff --git a/crates/dbx-types/src/database_manifest.rs b/crates/dbx-types/src/database_manifest.rs
index 0b11540045..21f51a8553 100644
--- a/crates/dbx-types/src/database_manifest.rs
+++ b/crates/dbx-types/src/database_manifest.rs
@@ -20,6 +20,30 @@ pub enum DatabaseRuntimeMode {
     External,
 }
 
+#[derive(Debug, Clone, Copy, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "lowercase")]
+pub enum DatabaseTransferObjectFamily {
+    Mysql,
+    Postgres,
+    Oracle,
+    SqlServer,
+}
+
+#[derive(Debug, Clone, Copy, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
+#[serde(rename_all = "kebab-case")]
+pub enum DatabaseTransferSupportLevel {
+    BestEffort,
+    FamilyCompatible,
+    Verified,
+}
+
+#[derive(Debug, Clone, Copy, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "lowercase")]
+pub enum DatabaseCompareMode {
+    Schema,
+    Data,
+}
+
 #[derive(Debug, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct DatabaseDriverProfile {
@@ -49,6 +73,12 @@ pub struct ManagedDriverEntry {
 #[serde(rename_all = "camelCase")]
 pub struct DatabaseManifestEntry {
     pub db_type: DatabaseType,
+    #[serde(default)]
+    pub compare_modes: Vec<DatabaseCompareMode>,
+    #[serde(default)]
+    pub transfer_object_family: Option<DatabaseTransferObjectFamily>,
+    #[serde(default)]
+    pub transfer_support_level: Option<DatabaseTransferSupportLevel>,
     pub label: String,
     #[serde(default)]
     pub dialect: Option<String>,
@@ -106,6 +136,18 @@ pub fn dialect_name(db_type: &DatabaseType) -> Option<&'static str> {
     entry(db_type).and_then(|candidate| candidate.dialect.as_deref())
 }
 
+pub fn transfer_object_family(db_type: &DatabaseType) -> Option<DatabaseTransferObjectFamily> {
+    entry(db_type).and_then(|candidate| candidate.transfer_object_family)
+}
+
+pub fn transfer_support_level(db_type: &DatabaseType) -> Option<DatabaseTransferSupportLevel> {
+    entry(db_type).and_then(|candidate| candidate.transfer_support_level)
+}
+
+pub fn supports_compare_mode(db_type: &DatabaseType, mode: DatabaseCompareMode) -> bool {
+    entry(db_type).is_some_and(|candidate| candidate.compare_modes.contains(&mode))
+}
+
 pub fn is_agent_runtime(db_type: &DatabaseType) -> bool {
     entry(db_type).is_some_and(|candidate| candidate.runtime_mode == DatabaseRuntimeMode::Agent)
 }
@@ -142,4 +184,33 @@ mod tests {
         assert_eq!(entry(&DatabaseType::Sqlite).map(|entry| entry.skip_tcp_probe), Some(true));
         assert_eq!(entry(&DatabaseType::H2).map(|entry| entry.agent_key.as_deref()), Some(Some("h2")));
     }
+
+    #[test]
+    fn transfer_object_families_come_from_the_shared_manifest() {
+        assert_eq!(transfer_object_family(&DatabaseType::Mysql), Some(DatabaseTransferObjectFamily::Mysql));
+        assert_eq!(transfer_object_family(&DatabaseType::Kingbase), Some(DatabaseTransferObjectFamily::Postgres));
+        assert_eq!(transfer_object_family(&DatabaseType::Dameng), Some(DatabaseTransferObjectFamily::Oracle));
+        assert_eq!(transfer_object_family(&DatabaseType::SqlServer), Some(DatabaseTransferObjectFamily::SqlServer));
+        assert_eq!(transfer_object_family(&DatabaseType::Sqlite), None);
+    }
+
+    #[test]
+    fn transfer_support_levels_distinguish_evidence_strength() {
+        assert_eq!(transfer_support_level(&DatabaseType::Mysql), Some(DatabaseTransferSupportLevel::Verified));
+        assert_eq!(
+            transfer_support_level(&DatabaseType::Kingbase),
+            Some(DatabaseTransferSupportLevel::FamilyCompatible)
+        );
+        assert_eq!(transfer_support_level(&DatabaseType::Db2), Some(DatabaseTransferSupportLevel::BestEffort));
+        assert_eq!(transfer_support_level(&DatabaseType::Gbase), None);
+    }
+
+    #[test]
+    fn compare_modes_come_from_the_shared_manifest() {
+        assert!(supports_compare_mode(&DatabaseType::Mysql, DatabaseCompareMode::Schema));
+        assert!(supports_compare_mode(&DatabaseType::Mysql, DatabaseCompareMode::Data));
+        assert!(supports_compare_mode(&DatabaseType::Kingbase, DatabaseCompareMode::Data));
+        assert!(!supports_compare_mode(&DatabaseType::MongoDb, DatabaseCompareMode::Data));
+        assert!(!supports_compare_mode(&DatabaseType::Redis, DatabaseCompareMode::Schema));
+    }
 }
diff --git a/crates/dbx-web/src/routes/transfer.rs b/crates/dbx-web/src/routes/transfer.rs
index 9d31acd223..7b73c95b6d 100644
--- a/crates/dbx-web/src/routes/transfer.rs
+++ b/crates/dbx-web/src/routes/transfer.rs
@@ -3,9 +3,7 @@ use std::sync::Arc;
 use axum::extract::{Path, State};
 use axum::response::sse::{Event, Sse};
 use axum::Json;
-use dbx_core::persistence::task_history::{
-    TaskHistoryStorageError, TaskItemStatus, TaskLifecycleOwner, TransferTaskJournal,
-};
+use dbx_core::persistence::task_history::{TaskHistoryStorageError, TaskLifecycleOwner, TransferTaskJournal};
 use dbx_core::transfer::{self, TransferRequest, TransferStatus};
 use futures::stream::Stream;
 use serde::Deserialize;
@@ -147,10 +145,6 @@ pub async fn start_transfer(
     let state_clone = state.clone();
 
     tokio::spawn(async move {
-        // Cross-family object transfers are validated inside transfer_schema_objects:
-        // only mechanically rewriteable kinds (views, sequences) are allowed; any
-        // other selection fails with a descriptive error. Structure-only data
-        // transfer is unsupported for MongoDB.
         if matches!(req.content, transfer::TransferContent::StructureOnly)
             && (matches!(source_db_type, dbx_core::models::connection::DatabaseType::MongoDb)
                 || matches!(target_db_type, dbx_core::models::connection::DatabaseType::MongoDb))
@@ -163,8 +157,6 @@ pub async fn start_transfer(
             return;
         }
 
-        // External Doris/StarRocks catalogs: pool is created with `catalog=` URL
-        // setup (SET catalog) and without USE <external-db>. See ensure_transfer_pool.
         let source_pool_key = match transfer::ensure_transfer_pool(
             &app,
             &req.source_connection_id,
@@ -173,9 +165,9 @@ pub async fn start_transfer(
         )
         .await
         {
-            Ok(k) => k,
-            Err(e) => {
-                send_transfer_progress(&progress_channel, &terminal_transfer_error(&req, e));
+            Ok(key) => key,
+            Err(error) => {
+                send_transfer_progress(&progress_channel, &terminal_transfer_error(&req, error));
                 finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
                 return;
             }
@@ -188,491 +180,35 @@ pub async fn start_transfer(
         )
         .await
         {
-            Ok(k) => k,
-            Err(e) => {
-                send_transfer_progress(&progress_channel, &terminal_transfer_error(&req, e));
+            Ok(key) => key,
+            Err(error) => {
+                send_transfer_progress(&progress_channel, &terminal_transfer_error(&req, error));
                 finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
                 return;
             }
         };
 
-        if let Err(e) = transfer::ensure_transfer_source_types_supported(&app, &req, &source_pool_key).await {
-            send_transfer_progress(&progress_channel, &terminal_transfer_error(&req, e));
+        if let Err(error) = transfer::ensure_transfer_source_types_supported(&app, &req, &source_pool_key).await {
+            send_transfer_progress(&progress_channel, &terminal_transfer_error(&req, error));
             finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
             return;
         }
 
-        let tables = req.tables.clone();
-        // Sort by FK dependency so referenced tables are transferred first, and
-        // keep the foreign key metadata fetched along the way — MySQL-family
-        // targets reuse it per table below instead of re-querying it.
-        // Skip for external Doris/StarRocks catalogs — the database name does
-        // not exist in the default catalog and sorting is unnecessary.
-        let (tables, known_foreign_keys) = {
-            let skip_fk_sort = {
-                let configs = app.configs.read().await;
-                configs
-                    .get(&req.source_connection_id)
-                    .and_then(|config| {
-                        transfer::resolve_external_transfer_catalog_for_config(req.source_catalog.as_deref(), config)
-                    })
-                    .is_some()
-            };
-            if skip_fk_sort {
-                (tables, std::collections::HashMap::new())
-            } else {
-                transfer::sort_tables_by_fk_dependency_with_foreign_keys(
-                    &app,
-                    &req.source_connection_id,
-                    &req.source_database,
-                    &req.source_schema,
-                    &tables,
-                    true,
-                )
-                .await
-                .unwrap_or_else(|e| {
-                    log::warn!("[transfer] failed to sort tables by FK dependency, using original order: {e}");
-                    (tables, std::collections::HashMap::new())
-                })
-            }
-        };
-        let mut failed_tables: Vec<String> = Vec::new();
-        let mut pending_fk_alters: Vec<(String, String)> = Vec::new();
-
-        // When drop_target_before_create is true, perform a rename pre-pass in
-        // parents_first=false order (children first) so that foreign keys on the
-        // backup tables remain intact. The main create/insert pass then runs in
-        // parents_first=true order (parents first).
-        // Children-first order used by the rename pre-pass, kept for the post-loop backup
-        // cleanup: a backup can still be referenced by another backup, so the drops must
-        // follow the same order.
-        let mut backup_drop_order: Vec<String> = Vec::new();
-        let backup_names = if req.drop_target_before_create {
-            // Re-sort tables in children-first order for the rename pre-pass
-            let (tables_for_rename, _) = transfer::sort_tables_by_fk_dependency_with_foreign_keys(
-                &app,
-                &req.target_connection_id,
-                &req.target_database,
-                &req.target_schema,
-                &tables,
-                false, // parents_first=false: children first
-            )
-            .await
-            .unwrap_or_else(|e| {
-                log::warn!("[transfer] failed to sort tables for rename pre-pass, using original order: {e}");
-                (tables.clone(), std::collections::HashMap::new())
-            });
-            backup_drop_order = tables_for_rename.clone();
-
-            let progress_channel_clone = progress_channel.clone();
-            match transfer::rename_tables_to_backup(
-                &app,
-                &req,
-                &tables_for_rename,
-                target_db_type,
-                &target_pool_key,
-                |progress| {
-                    send_transfer_progress(&progress_channel_clone, &progress);
-                },
-            )
-            .await
-            {
-                Ok(names) => Some(names),
-                Err(e) if e == "Cancelled" => {
-                    let progress = transfer::TransferProgress {
-                        transfer_id: req.transfer_id.clone(),
-                        table: "rename pre-pass".to_string(),
-                        table_index: 0,
-                        total_tables: tables.len(),
-                        rows_transferred: 0,
-                        total_rows: None,
-                        status: TransferStatus::Cancelled,
-                        error: None,
-                        terminal: true,
-                    };
-                    send_transfer_progress(&progress_channel, &progress);
-                    finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
-                    return;
-                }
-                Err(e) => {
-                    let progress = transfer::TransferProgress {
-                        transfer_id: req.transfer_id.clone(),
-                        table: "rename pre-pass".to_string(),
-                        table_index: 0,
-                        total_tables: tables.len(),
-                        rows_transferred: 0,
-                        total_rows: None,
-                        status: TransferStatus::Error,
-                        error: Some(e),
-                        terminal: true,
-                    };
-                    send_transfer_progress(&progress_channel, &progress);
-                    finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
-                    return;
-                }
-            }
-        } else {
-            None
-        };
-
-        if matches!(source_db_type, dbx_core::models::connection::DatabaseType::Postgres)
-            && matches!(target_db_type, dbx_core::models::connection::DatabaseType::Postgres)
-        {
-            let progress_channel_clone = progress_channel.clone();
-            match transfer::transfer_postgres_schema_dependencies(
-                &app,
-                &req,
-                &source_pool_key,
-                &target_pool_key,
-                |progress| {
-                    send_transfer_progress(&progress_channel_clone, &progress);
-                },
-            )
-            .await
-            {
-                Ok(()) => {}
-                Err(e) if e == "Cancelled" => {
-                    let progress = transfer::TransferProgress {
-                        transfer_id: req.transfer_id.clone(),
-                        table: "schema dependencies".to_string(),
-                        table_index: 0,
-                        total_tables: tables.len(),
-                        rows_transferred: 0,
-                        total_rows: None,
-                        status: TransferStatus::Cancelled,
-                        error: None,
-                        terminal: true,
-                    };
-                    send_transfer_progress(&progress_channel, &progress);
-                    finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
-                    return;
-                }
-                Err(e) => {
-                    let progress = transfer::TransferProgress {
-                        transfer_id: req.transfer_id.clone(),
-                        table: "schema dependencies".to_string(),
-                        table_index: 0,
-                        total_tables: tables.len(),
-                        rows_transferred: 0,
-                        total_rows: None,
-                        status: TransferStatus::Error,
-                        error: Some(e),
-                        terminal: true,
-                    };
-                    send_transfer_progress(&progress_channel, &progress);
-                    finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
-                    return;
-                }
-            }
-        }
-
-        // Overwrite clears each target right before copying it, parents first, which cannot
-        // clear a table another selected table references. Empty those children first now.
-        let overwrite_cleared = match transfer::clear_foreign_key_linked_overwrite_targets(
-            &app,
-            &req,
-            &tables,
+        let task_transfer_id = req.transfer_id.clone();
+        let progress_channel_for_run = progress_channel.clone();
+        let terminal = dbx_core::transfer_runner::run_transfer(
+            app,
+            req,
+            source_db_type,
             target_db_type,
-            &target_pool_key,
+            source_pool_key,
+            target_pool_key,
+            history,
+            move |progress| send_transfer_progress(&progress_channel_for_run, &progress),
         )
-        .await
-        {
-            Ok(cleared) => cleared,
-            Err(e) => {
-                let progress = transfer::TransferProgress {
-                    transfer_id: req.transfer_id.clone(),
-                    table: "overwrite pre-pass".to_string(),
-                    table_index: 0,
-                    total_tables: tables.len(),
-                    rows_transferred: 0,
-                    total_rows: None,
-                    status: TransferStatus::Error,
-                    error: Some(e),
-                    terminal: true,
-                };
-                send_transfer_progress(&progress_channel, &progress);
-                finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
-                return;
-            }
-        };
-
-        for (i, table) in tables.iter().enumerate() {
-            if transfer::is_cancelled(&req.transfer_id).await {
-                let progress = transfer::TransferProgress {
-                    transfer_id: req.transfer_id.clone(),
-                    table: table.clone(),
-                    table_index: i,
-                    total_tables: tables.len(),
-                    rows_transferred: 0,
-                    total_rows: None,
-                    status: TransferStatus::Cancelled,
-                    error: None,
-                    terminal: true,
-                };
-                send_transfer_progress(&progress_channel, &progress);
-                finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
-                return;
-            }
-
-            let history_item_index =
-                history.as_ref().and_then(|journal| journal.item_index_for_table(table)).unwrap_or(i);
-            if let Some(journal) = history.as_ref() {
-                journal.start_table(history_item_index).await;
-            }
-            let progress_channel_clone = progress_channel.clone();
-            let mut last_rows_transferred = 0_u64;
-            let mut last_total_rows = None;
-            let mut source_row_count = None;
-            let mut moved_row_count = None;
-            let history_for_progress = history.as_ref();
-            let history_for_count = history.as_ref();
-            let result = transfer::transfer_table_with_result(
-                &app,
-                &req,
-                table,
-                i,
-                &source_db_type,
-                &target_db_type,
-                &source_pool_key,
-                &target_pool_key,
-                &known_foreign_keys,
-                &mut pending_fk_alters,
-                backup_names.as_ref(),
-                overwrite_cleared.contains(table),
-                |progress| {
-                    last_rows_transferred = progress.rows_transferred;
-                    last_total_rows = progress.total_rows;
-                    moved_row_count = Some(progress.rows_transferred);
-                    if let Some(journal) = history_for_progress {
-                        journal.observe_table_progress(history_item_index, progress.rows_transferred);
-                    }
-                    send_transfer_progress(&progress_channel_clone, &progress);
-                },
-                |source_count| {
-                    source_row_count = source_count;
-                    if let Some(journal) = history_for_count {
-                        journal.observe_source_count(history_item_index, source_count);
-                    }
-                },
-            )
-            .await;
-
-            match result {
-                Ok(result) => {
-                    if let Some(journal) = history.as_ref() {
-                        journal
-                            .finish_table(
-                                history_item_index,
-                                TaskItemStatus::Succeeded,
-                                result.source_row_count,
-                                Some(result.moved_rows),
-                            )
-                            .await;
-                    }
-                    let progress = transfer::TransferProgress {
-                        transfer_id: req.transfer_id.clone(),
-                        table: table.clone(),
-                        table_index: i,
-                        total_tables: tables.len(),
-                        rows_transferred: result.moved_rows,
-                        total_rows: last_total_rows.or(Some(result.moved_rows)),
-                        status: TransferStatus::TableDone,
-                        error: None,
-                        terminal: false,
-                    };
-                    send_transfer_progress(&progress_channel, &progress);
-                }
-                Err(e) => {
-                    if e == "Cancelled" {
-                        if let Some(journal) = history.as_ref() {
-                            journal
-                                .finish_table(
-                                    history_item_index,
-                                    TaskItemStatus::Cancelled,
-                                    source_row_count,
-                                    moved_row_count,
-                                )
-                                .await;
-                        }
-                        let progress = transfer::TransferProgress {
-                            transfer_id: req.transfer_id.clone(),
-                            table: table.clone(),
-                            table_index: i,
-                            total_tables: tables.len(),
-                            rows_transferred: 0,
-                            total_rows: None,
-                            status: TransferStatus::Cancelled,
-                            error: None,
-                            terminal: true,
-                        };
-                        send_transfer_progress(&progress_channel, &progress);
-                        finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
-                        return;
-                    }
-                    if let Some(journal) = history.as_ref() {
-                        journal
-                            .finish_table(history_item_index, TaskItemStatus::Failed, source_row_count, moved_row_count)
-                            .await;
-                    }
-                    failed_tables.push(table.clone());
-                    let progress = transfer::TransferProgress {
-                        transfer_id: req.transfer_id.clone(),
-                        table: table.clone(),
-                        table_index: i,
-                        total_tables: tables.len(),
-                        rows_transferred: last_rows_transferred,
-                        total_rows: last_total_rows,
-                        status: TransferStatus::Error,
-                        error: Some(e),
-                        terminal: false,
-                    };
-                    send_transfer_progress(&progress_channel, &progress);
-                }
-            }
-        }
-
-        // Add any foreign keys deferred during MySQL-family table creation now that
-        // every selected table exists — see transfer_table's use of
-        // strip_inline_foreign_key_constraint_lines for why these can't be created
-        // inline (a foreign key cycle has no valid CREATE TABLE order at all). The
-        // rename pre-pass already freed the backup constraint names, so these re-create
-        // the original names without colliding.
-        let mut failed_fk_tables: Vec<String> = Vec::new();
-        let mut failed_fk_count = 0usize;
-        for (table, alter_sql) in &pending_fk_alters {
-            if let Err(e) = transfer::execute_on_pool(&app, &target_pool_key, alter_sql).await {
-                log::warn!("[transfer] failed to add deferred foreign key constraint for {table}: {e}");
-                failed_fk_count += 1;
-                failed_fk_tables.push(table.clone());
-            }
-        }
-        if failed_fk_count > 0 {
-            failed_fk_tables.sort();
-            failed_fk_tables.dedup();
-            failed_tables.push(format!("{} foreign key(s) on: {}", failed_fk_count, failed_fk_tables.join(", ")));
-        }
-
-        // Transfer selected non-table objects (views, procedures, functions,
-        // triggers, sequences, events) after the per-table loop. The shared
-        // Core decision handles all content modes: DataOnly never
-        // transfers schema objects; PG→PG keeps the legacy empty-selection
-        // default only when structure participates in the transfer.
-        let mut object_outcome = transfer::TransferObjectOutcome::default();
-        let progress_channel_clone = progress_channel.clone();
-        match transfer::transfer_schema_objects(&app, &req, &source_pool_key, &target_pool_key, |progress| {
-            send_transfer_progress(&progress_channel_clone, &progress);
-        })
-        .await
-        {
-            Ok(outcome) => {
-                if let Some(journal) = history.as_ref() {
-                    journal.record_object_outcome(&outcome).await;
-                }
-                object_outcome = outcome;
-            }
-            Err(e) if e == "Cancelled" => {
-                if let Some(journal) = history.as_ref() {
-                    journal.record_schema_objects_error(true).await;
-                }
-                let progress = transfer::TransferProgress {
-                    transfer_id: req.transfer_id.clone(),
-                    table: "schema objects".to_string(),
-                    table_index: tables.len(),
-                    total_tables: tables.len(),
-                    rows_transferred: 0,
-                    total_rows: None,
-                    status: TransferStatus::Cancelled,
-                    error: None,
-                    terminal: true,
-                };
-                send_transfer_progress(&progress_channel, &progress);
-                finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
-                return;
-            }
-            Err(e) => {
-                if let Some(journal) = history.as_ref() {
-                    journal.record_schema_objects_error(false).await;
-                }
-                failed_tables.push("schema objects".to_string());
-                let progress = transfer::TransferProgress {
-                    transfer_id: req.transfer_id.clone(),
-                    table: "schema objects".to_string(),
-                    table_index: tables.len(),
-                    total_tables: tables.len(),
-                    rows_transferred: 0,
-                    total_rows: None,
-                    status: TransferStatus::Error,
-                    error: Some(e),
-                    terminal: false,
-                };
-                send_transfer_progress(&progress_channel, &progress);
-            }
-        }
-
-        // Send done
-        if !object_outcome.failed.is_empty() {
-            failed_tables.push(format!("schema objects ({})", object_outcome.failed.len()));
-        }
-
-        // The rename pre-pass left one backup per rebuilt table. Drop them only now that
-        // every table, every deferred foreign key and every selected schema object has
-        // succeeded — a failure anywhere above keeps the originals recoverable under
-        // their backup names.
-        if let Some(backup_names) = backup_names.as_ref() {
-            if failed_tables.is_empty() {
-                if let Err(e) = transfer::drop_backup_tables(
-                    &app,
-                    &req,
-                    target_db_type,
-                    &target_pool_key,
-                    backup_names,
-                    &backup_drop_order,
-                )
-                .await
-                {
-                    failed_tables.push(e);
-                }
-            } else {
-                log::warn!(
-                    "[transfer] keeping {} backup table(s) because {} step(s) failed",
-                    backup_names.len(),
-                    failed_tables.len()
-                );
-            }
-        }
-        let skip_suffix = if !object_outcome.skipped.is_empty() && failed_tables.is_empty() {
-            format!("，跳过 {} 个已存在对象", object_outcome.skipped.len())
-        } else if !object_outcome.skipped.is_empty() {
-            format!("；跳过 {} 个已存在对象", object_outcome.skipped.len())
-        } else {
-            String::new()
-        };
-        let done = transfer::TransferProgress {
-            transfer_id: req.transfer_id.clone(),
-            table: String::new(),
-            table_index: tables.len(),
-            total_tables: tables.len(),
-            rows_transferred: 0,
-            total_rows: None,
-            status: if failed_tables.is_empty() { TransferStatus::Done } else { TransferStatus::Error },
-            error: if failed_tables.is_empty() {
-                if skip_suffix.is_empty() {
-                    None
-                } else {
-                    Some(skip_suffix.clone())
-                }
-            } else {
-                Some(format!(
-                    "{} table(s) failed: {}{}",
-                    failed_tables.len(),
-                    failed_tables.iter().take(5).cloned().collect::<Vec<_>>().join(", "),
-                    skip_suffix
-                ))
-            },
-            terminal: true,
-        };
-        send_transfer_progress(&progress_channel, &done);
-        finish_transfer_channel(&state_clone, &req.transfer_id, &progress_channel).await;
+        .await;
+        send_transfer_progress(&progress_channel, &terminal);
+        finish_transfer_channel(&state_clone, &task_transfer_id, &progress_channel).await;
     });
 
     Ok(Json(serde_json::json!({ "transferId": transfer_id })))
diff --git a/plugins/connection-types/access.yaml b/plugins/connection-types/access.yaml
index f9649a2b88..e8b248e572 100644
--- a/plugins/connection-types/access.yaml
+++ b/plugins/connection-types/access.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 460
 dbType: access
+compareModes: [schema, data]
 rustVariant: Access
 label: Microsoft Access
 dialect: Access
diff --git a/plugins/connection-types/argo.yaml b/plugins/connection-types/argo.yaml
index fa51a04060..dde9d8337e 100644
--- a/plugins/connection-types/argo.yaml
+++ b/plugins/connection-types/argo.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 515
 dbType: argo
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Argo
 label: 星环Argo
 runtimeMode: agent
diff --git a/plugins/connection-types/bigquery.yaml b/plugins/connection-types/bigquery.yaml
index 051d7b4b6e..271925bcb3 100644
--- a/plugins/connection-types/bigquery.yaml
+++ b/plugins/connection-types/bigquery.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 580
 dbType: bigquery
+compareModes: [schema, data]
 rustVariant: Bigquery
 label: Google BigQuery
 runtimeMode: agent
diff --git a/plugins/connection-types/clickhouse.yaml b/plugins/connection-types/clickhouse.yaml
index a3ea5d3945..7b9c3cfa52 100644
--- a/plugins/connection-types/clickhouse.yaml
+++ b/plugins/connection-types/clickhouse.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 90
 dbType: clickhouse
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: ClickHouse
 label: ClickHouse
 dialect: ClickHouse
diff --git a/plugins/connection-types/cloudflare-d1.yaml b/plugins/connection-types/cloudflare-d1.yaml
index df4b5c658f..0c4993a919 100644
--- a/plugins/connection-types/cloudflare-d1.yaml
+++ b/plugins/connection-types/cloudflare-d1.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 60
 dbType: cloudflare-d1
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: CloudflareD1
 label: Cloudflare D1
 dialect: SQLite
diff --git a/plugins/connection-types/dameng.yaml b/plugins/connection-types/dameng.yaml
index f342de1a4f..77072c9d58 100644
--- a/plugins/connection-types/dameng.yaml
+++ b/plugins/connection-types/dameng.yaml
@@ -1,6 +1,9 @@
 schemaVersion: 1
 order: 260
 dbType: dameng
+compareModes: [schema, data]
+transferSupportLevel: family-compatible
+transferObjectFamily: oracle
 rustVariant: Dameng
 label: 达梦 DM8
 dialect: Dameng
diff --git a/plugins/connection-types/databend.yaml b/plugins/connection-types/databend.yaml
index 1f1ec42400..1e5526cb38 100644
--- a/plugins/connection-types/databend.yaml
+++ b/plugins/connection-types/databend.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 320
 dbType: databend
+compareModes: [schema, data]
 rustVariant: Databend
 label: Databend
 dialect: Databend
diff --git a/plugins/connection-types/databricks.yaml b/plugins/connection-types/databricks.yaml
index 2b2e571bfe..99926f5382 100644
--- a/plugins/connection-types/databricks.yaml
+++ b/plugins/connection-types/databricks.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 360
 dbType: databricks
+compareModes: [schema, data]
 rustVariant: Databricks
 label: Databricks SQL
 runtimeMode: agent
diff --git a/plugins/connection-types/db2.yaml b/plugins/connection-types/db2.yaml
index 721e0eb830..4fcfb4a76e 100644
--- a/plugins/connection-types/db2.yaml
+++ b/plugins/connection-types/db2.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 540
 dbType: db2
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Db2
 label: IBM DB2
 runtimeMode: agent
diff --git a/plugins/connection-types/doris.yaml b/plugins/connection-types/doris.yaml
index bd96f0523c..aa7f9670d4 100644
--- a/plugins/connection-types/doris.yaml
+++ b/plugins/connection-types/doris.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 220
 dbType: doris
+compareModes: [schema, data]
 rustVariant: Doris
 label: Doris
 dialect: Doris
diff --git a/plugins/connection-types/duckdb.yaml b/plugins/connection-types/duckdb.yaml
index 8324b35523..3147f2ae3f 100644
--- a/plugins/connection-types/duckdb.yaml
+++ b/plugins/connection-types/duckdb.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 80
 dbType: duckdb
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: DuckDb
 label: DuckDB
 dialect: DuckDB
diff --git a/plugins/connection-types/exasol.yaml b/plugins/connection-types/exasol.yaml
index 650eca0f49..ab88670ad5 100644
--- a/plugins/connection-types/exasol.yaml
+++ b/plugins/connection-types/exasol.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 410
 dbType: exasol
+compareModes: [schema, data]
 rustVariant: Exasol
 label: Exasol
 dialect: Exasol
diff --git a/plugins/connection-types/firebird.yaml b/plugins/connection-types/firebird.yaml
index 562087ee0b..972ce61213 100644
--- a/plugins/connection-types/firebird.yaml
+++ b/plugins/connection-types/firebird.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 400
 dbType: firebird
+compareModes: [schema, data]
 rustVariant: Firebird
 label: Firebird
 dialect: Firebird
diff --git a/plugins/connection-types/gaussdb.yaml b/plugins/connection-types/gaussdb.yaml
index 897270ade1..e2e3a52482 100644
--- a/plugins/connection-types/gaussdb.yaml
+++ b/plugins/connection-types/gaussdb.yaml
@@ -1,6 +1,9 @@
 schemaVersion: 1
 order: 330
 dbType: gaussdb
+compareModes: [schema, data]
+transferSupportLevel: family-compatible
+transferObjectFamily: postgres
 rustVariant: Gaussdb
 label: GaussDB
 dialect: GaussDB
diff --git a/plugins/connection-types/gbase.yaml b/plugins/connection-types/gbase.yaml
index b006aa814c..9fd8958637 100644
--- a/plugins/connection-types/gbase.yaml
+++ b/plugins/connection-types/gbase.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 450
 dbType: gbase
+compareModes: [schema, data]
+transferObjectFamily: mysql
 rustVariant: Gbase
 label: 南大通用 GBase 8a
 dialect: GBase
diff --git a/plugins/connection-types/goldendb.yaml b/plugins/connection-types/goldendb.yaml
index 397dff71eb..692c0d1e47 100644
--- a/plugins/connection-types/goldendb.yaml
+++ b/plugins/connection-types/goldendb.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 310
 dbType: goldendb
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Goldendb
 label: 金篆 GoldenDB
 dialect: GoldenDB
diff --git a/plugins/connection-types/h2.yaml b/plugins/connection-types/h2.yaml
index 9361a96d54..115e64a152 100644
--- a/plugins/connection-types/h2.yaml
+++ b/plugins/connection-types/h2.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 470
 dbType: h2
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: H2
 label: H2
 dialect: H2
diff --git a/plugins/connection-types/highgo.yaml b/plugins/connection-types/highgo.yaml
index 99178e4064..3ccdadc8ff 100644
--- a/plugins/connection-types/highgo.yaml
+++ b/plugins/connection-types/highgo.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 280
 dbType: highgo
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Highgo
 label: 瀚高 HighGo
 dialect: HighGo
diff --git a/plugins/connection-types/hive.yaml b/plugins/connection-types/hive.yaml
index 4347060fe0..8cd4f8fd6f 100644
--- a/plugins/connection-types/hive.yaml
+++ b/plugins/connection-types/hive.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 510
 dbType: hive
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Hive
 label: Apache Hive
 runtimeMode: agent
diff --git a/plugins/connection-types/ignite.yaml b/plugins/connection-types/ignite.yaml
index f794e5effe..4ba6d65177 100644
--- a/plugins/connection-types/ignite.yaml
+++ b/plugins/connection-types/ignite.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 610
 dbType: ignite
+compareModes: [schema, data]
 rustVariant: Ignite
 label: Apache Ignite
 runtimeMode: agent
diff --git a/plugins/connection-types/ignite3.yaml b/plugins/connection-types/ignite3.yaml
index bf2b75b3b2..25c72c1afb 100644
--- a/plugins/connection-types/ignite3.yaml
+++ b/plugins/connection-types/ignite3.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 620
 dbType: ignite3
+compareModes: [schema, data]
 rustVariant: Ignite3
 label: Apache Ignite 3
 runtimeMode: agent
diff --git a/plugins/connection-types/impala.yaml b/plugins/connection-types/impala.yaml
index 753f3a57d8..a84f5003c6 100644
--- a/plugins/connection-types/impala.yaml
+++ b/plugins/connection-types/impala.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 530
 dbType: impala
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Impala
 label: Apache Impala
 runtimeMode: agent
diff --git a/plugins/connection-types/influxdb3.yaml b/plugins/connection-types/influxdb3.yaml
index c502c03806..9197fdc0b8 100644
--- a/plugins/connection-types/influxdb3.yaml
+++ b/plugins/connection-types/influxdb3.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 755
 dbType: influxdb3
+compareModes: [schema, data]
 rustVariant: InfluxDb3
 label: InfluxDB 3.x
 runtimeMode: native
diff --git a/plugins/connection-types/informix.yaml b/plugins/connection-types/informix.yaml
index e3f5d7f7a5..2569a2ce12 100644
--- a/plugins/connection-types/informix.yaml
+++ b/plugins/connection-types/informix.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 550
 dbType: informix
+compareModes: [schema, data]
 rustVariant: Informix
 label: IBM Informix
 dialect: Informix
diff --git a/plugins/connection-types/iotdb.yaml b/plugins/connection-types/iotdb.yaml
index bd9709cab0..aaa749af43 100644
--- a/plugins/connection-types/iotdb.yaml
+++ b/plugins/connection-types/iotdb.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 730
 dbType: iotdb
+compareModes: [schema, data]
 rustVariant: Iotdb
 label: Apache IoTDB
 runtimeMode: agent
diff --git a/plugins/connection-types/iris.yaml b/plugins/connection-types/iris.yaml
index 8f79d66375..b797c49d62 100644
--- a/plugins/connection-types/iris.yaml
+++ b/plugins/connection-types/iris.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 740
 dbType: iris
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Iris
 label: InterSystems IRIS
 dialect: Iris
diff --git a/plugins/connection-types/kingbase.yaml b/plugins/connection-types/kingbase.yaml
index ff93e676c6..cefab20a9e 100644
--- a/plugins/connection-types/kingbase.yaml
+++ b/plugins/connection-types/kingbase.yaml
@@ -1,6 +1,9 @@
 schemaVersion: 1
 order: 270
 dbType: kingbase
+compareModes: [schema, data]
+transferSupportLevel: family-compatible
+transferObjectFamily: postgres
 rustVariant: Kingbase
 label: 金仓KingbaseES
 dialect: Kingbase
diff --git a/plugins/connection-types/kwdb.yaml b/plugins/connection-types/kwdb.yaml
index 4e7dccc82f..5c29c28a94 100644
--- a/plugins/connection-types/kwdb.yaml
+++ b/plugins/connection-types/kwdb.yaml
@@ -1,6 +1,9 @@
 schemaVersion: 1
 order: 340
 dbType: kwdb
+compareModes: [schema, data]
+transferSupportLevel: family-compatible
+transferObjectFamily: postgres
 rustVariant: Kwdb
 label: KWDB
 dialect: KwDB
diff --git a/plugins/connection-types/kylin.yaml b/plugins/connection-types/kylin.yaml
index 2c4cb1e0b8..7504ccfd4a 100644
--- a/plugins/connection-types/kylin.yaml
+++ b/plugins/connection-types/kylin.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 600
 dbType: kylin
+compareModes: [schema, data]
 rustVariant: Kylin
 label: Apache Kylin
 runtimeMode: agent
diff --git a/plugins/connection-types/kyuubi.yaml b/plugins/connection-types/kyuubi.yaml
index c13f03c7bc..3f316f60e0 100644
--- a/plugins/connection-types/kyuubi.yaml
+++ b/plugins/connection-types/kyuubi.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 520
 dbType: kyuubi
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Kyuubi
 label: Apache Kyuubi
 runtimeMode: agent
diff --git a/plugins/connection-types/manticoresearch.yaml b/plugins/connection-types/manticoresearch.yaml
index e5374cd17a..3b0fd37e37 100644
--- a/plugins/connection-types/manticoresearch.yaml
+++ b/plugins/connection-types/manticoresearch.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 240
 dbType: manticoresearch
+compareModes: [schema, data]
 rustVariant: ManticoreSearch
 label: Manticore Search
 dialect: ManticoreSearch
diff --git a/plugins/connection-types/mongodb.yaml b/plugins/connection-types/mongodb.yaml
index 6c9e7c4e56..e7358c993f 100644
--- a/plugins/connection-types/mongodb.yaml
+++ b/plugins/connection-types/mongodb.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 110
 dbType: mongodb
+transferSupportLevel: best-effort
 rustVariant: MongoDb
 label: MongoDB (Legacy)
 runtimeMode: agent
diff --git a/plugins/connection-types/mysql.yaml b/plugins/connection-types/mysql.yaml
index c1e69f87f4..aef3f953ad 100644
--- a/plugins/connection-types/mysql.yaml
+++ b/plugins/connection-types/mysql.yaml
@@ -1,6 +1,9 @@
 schemaVersion: 1
 order: 10
 dbType: mysql
+compareModes: [schema, data]
+transferSupportLevel: verified
+transferObjectFamily: mysql
 rustVariant: Mysql
 label: MySQL
 dialect: MySQL
diff --git a/plugins/connection-types/oceanbase-oracle.yaml b/plugins/connection-types/oceanbase-oracle.yaml
index df5589f018..887f39894d 100644
--- a/plugins/connection-types/oceanbase-oracle.yaml
+++ b/plugins/connection-types/oceanbase-oracle.yaml
@@ -1,6 +1,9 @@
 schemaVersion: 1
 order: 440
 dbType: oceanbase-oracle
+compareModes: [schema, data]
+transferSupportLevel: family-compatible
+transferObjectFamily: oracle
 rustVariant: OceanbaseOracle
 label: OceanBase Oracle Mode
 dialect: OceanBase
diff --git a/plugins/connection-types/opengauss.yaml b/plugins/connection-types/opengauss.yaml
index ef4035adc7..8914c2cf1a 100644
--- a/plugins/connection-types/opengauss.yaml
+++ b/plugins/connection-types/opengauss.yaml
@@ -1,6 +1,9 @@
 schemaVersion: 1
 order: 420
 dbType: opengauss
+compareModes: [schema, data]
+transferSupportLevel: family-compatible
+transferObjectFamily: postgres
 rustVariant: OpenGauss
 label: openGauss
 dialect: openGauss
diff --git a/plugins/connection-types/oracle.yaml b/plugins/connection-types/oracle.yaml
index 86bbc01e67..713f8cc14a 100644
--- a/plugins/connection-types/oracle.yaml
+++ b/plugins/connection-types/oracle.yaml
@@ -1,6 +1,9 @@
 schemaVersion: 1
 order: 130
 dbType: oracle
+compareModes: [schema, data]
+transferSupportLevel: verified
+transferObjectFamily: oracle
 rustVariant: Oracle
 label: Oracle
 dialect: Oracle
diff --git a/plugins/connection-types/oscar.yaml b/plugins/connection-types/oscar.yaml
index 8b897e6669..89d93e0e55 100644
--- a/plugins/connection-types/oscar.yaml
+++ b/plugins/connection-types/oscar.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 640
 dbType: oscar
+compareModes: [schema, data]
 rustVariant: Oscar
 label: 神通 OSCAR
 runtimeMode: agent
diff --git a/plugins/connection-types/postgres.yaml b/plugins/connection-types/postgres.yaml
index c48cab34bd..fdde8224a5 100644
--- a/plugins/connection-types/postgres.yaml
+++ b/plugins/connection-types/postgres.yaml
@@ -1,6 +1,9 @@
 schemaVersion: 1
 order: 20
 dbType: postgres
+compareModes: [schema, data]
+transferSupportLevel: verified
+transferObjectFamily: postgres
 rustVariant: Postgres
 label: PostgreSQL
 dialect: PostgreSQL
diff --git a/plugins/connection-types/prestosql.yaml b/plugins/connection-types/prestosql.yaml
index be095e26fc..759dd5438b 100644
--- a/plugins/connection-types/prestosql.yaml
+++ b/plugins/connection-types/prestosql.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 500
 dbType: prestosql
+compareModes: [schema, data]
 rustVariant: PrestoSql
 label: PrestoSQL
 runtimeMode: external
diff --git a/plugins/connection-types/questdb.yaml b/plugins/connection-types/questdb.yaml
index adf52ca36e..1ce3dd5c0d 100644
--- a/plugins/connection-types/questdb.yaml
+++ b/plugins/connection-types/questdb.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 430
 dbType: questdb
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Questdb
 label: QuestDB
 dialect: QuestDB
diff --git a/plugins/connection-types/redshift.yaml b/plugins/connection-types/redshift.yaml
index 9cdbe930d0..e7189b50a7 100644
--- a/plugins/connection-types/redshift.yaml
+++ b/plugins/connection-types/redshift.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 250
 dbType: redshift
+compareModes: [schema, data]
 rustVariant: Redshift
 label: Redshift
 dialect: Redshift
diff --git a/plugins/connection-types/rqlite.yaml b/plugins/connection-types/rqlite.yaml
index d7f28dfb2f..a8da35f0ed 100644
--- a/plugins/connection-types/rqlite.yaml
+++ b/plugins/connection-types/rqlite.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 40
 dbType: rqlite
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Rqlite
 label: RQLite
 dialect: Rqlite
diff --git a/plugins/connection-types/saphana.yaml b/plugins/connection-types/saphana.yaml
index 045b420f6f..c2a9259ad4 100644
--- a/plugins/connection-types/saphana.yaml
+++ b/plugins/connection-types/saphana.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 370
 dbType: saphana
+compareModes: [schema, data]
 rustVariant: SapHana
 label: SAP HANA
 runtimeMode: agent
diff --git a/plugins/connection-types/snowflake.yaml b/plugins/connection-types/snowflake.yaml
index 58354b3f37..95babc1e51 100644
--- a/plugins/connection-types/snowflake.yaml
+++ b/plugins/connection-types/snowflake.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 480
 dbType: snowflake
+compareModes: [schema, data]
 rustVariant: Snowflake
 label: Snowflake
 runtimeMode: agent
diff --git a/plugins/connection-types/spanner.yaml b/plugins/connection-types/spanner.yaml
index 988f3fd0ba..0663dfb9a0 100644
--- a/plugins/connection-types/spanner.yaml
+++ b/plugins/connection-types/spanner.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 590
 dbType: spanner
+compareModes: [schema, data]
 rustVariant: Spanner
 label: Google Cloud Spanner
 runtimeMode: agent
diff --git a/plugins/connection-types/spark.yaml b/plugins/connection-types/spark.yaml
index ee0fc8f582..50c8047388 100644
--- a/plugins/connection-types/spark.yaml
+++ b/plugins/connection-types/spark.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 780
 dbType: spark
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Spark
 label: Apache Spark
 runtimeMode: agent
diff --git a/plugins/connection-types/sqlite.yaml b/plugins/connection-types/sqlite.yaml
index 0eb2a835cb..215eaeefa7 100644
--- a/plugins/connection-types/sqlite.yaml
+++ b/plugins/connection-types/sqlite.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 30
 dbType: sqlite
+compareModes: [schema, data]
+transferSupportLevel: verified
 rustVariant: Sqlite
 label: SQLite
 dialect: SQLite
diff --git a/plugins/connection-types/sqlserver.yaml b/plugins/connection-types/sqlserver.yaml
index cdc3ff0b89..d574a220b6 100644
--- a/plugins/connection-types/sqlserver.yaml
+++ b/plugins/connection-types/sqlserver.yaml
@@ -1,6 +1,9 @@
 schemaVersion: 1
 order: 100
 dbType: sqlserver
+compareModes: [schema, data]
+transferSupportLevel: verified
+transferObjectFamily: sqlserver
 rustVariant: SqlServer
 label: SQL Server
 dialect: SQL Server
diff --git a/plugins/connection-types/starrocks.yaml b/plugins/connection-types/starrocks.yaml
index 732f077942..9bc1ae2b62 100644
--- a/plugins/connection-types/starrocks.yaml
+++ b/plugins/connection-types/starrocks.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 230
 dbType: starrocks
+compareModes: [schema, data]
 rustVariant: StarRocks
 label: StarRocks
 dialect: StarRocks
diff --git a/plugins/connection-types/sundb.yaml b/plugins/connection-types/sundb.yaml
index 7f45d0221c..447674fccb 100644
--- a/plugins/connection-types/sundb.yaml
+++ b/plugins/connection-types/sundb.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 630
 dbType: sundb
+compareModes: [schema, data]
 rustVariant: Sundb
 label: 科蓝 SUNDB
 dialect: SunDB
diff --git a/plugins/connection-types/tdengine.yaml b/plugins/connection-types/tdengine.yaml
index b853ddb19c..a349321701 100644
--- a/plugins/connection-types/tdengine.yaml
+++ b/plugins/connection-types/tdengine.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 650
 dbType: tdengine
+compareModes: [schema, data]
 rustVariant: Tdengine
 label: TDengine
 runtimeMode: agent
diff --git a/plugins/connection-types/teradata.yaml b/plugins/connection-types/teradata.yaml
index eb1870a26e..f81a8cf7a0 100644
--- a/plugins/connection-types/teradata.yaml
+++ b/plugins/connection-types/teradata.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 380
 dbType: teradata
+compareModes: [schema, data]
 rustVariant: Teradata
 label: Teradata
 runtimeMode: agent
diff --git a/plugins/connection-types/transwarp.yaml b/plugins/connection-types/transwarp.yaml
index 99b43db3dd..4ec06aba01 100644
--- a/plugins/connection-types/transwarp.yaml
+++ b/plugins/connection-types/transwarp.yaml
@@ -2,6 +2,8 @@ schemaVersion: 1
 order: 516
 
 dbType: transwarp
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Transwarp
 label: 星环Inceptor
 dialect: Transwarp
diff --git a/plugins/connection-types/trino.yaml b/plugins/connection-types/trino.yaml
index 1dc11b8375..b33fb39737 100644
--- a/plugins/connection-types/trino.yaml
+++ b/plugins/connection-types/trino.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 490
 dbType: trino
+compareModes: [schema, data]
 rustVariant: Trino
 label: Trino
 runtimeMode: agent
diff --git a/plugins/connection-types/turso.yaml b/plugins/connection-types/turso.yaml
index e371dc0da2..a811f9a7ee 100644
--- a/plugins/connection-types/turso.yaml
+++ b/plugins/connection-types/turso.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 50
 dbType: turso
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Turso
 label: Turso
 dialect: Turso
diff --git a/plugins/connection-types/uxdb.yaml b/plugins/connection-types/uxdb.yaml
index 256e0eeab3..0d9f8540a5 100644
--- a/plugins/connection-types/uxdb.yaml
+++ b/plugins/connection-types/uxdb.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 290
 dbType: uxdb
+compareModes: [schema, data]
 rustVariant: Uxdb
 label: 优炫 UXDB
 dialect: PostgreSQL
diff --git a/plugins/connection-types/vastbase.yaml b/plugins/connection-types/vastbase.yaml
index 7cd1581ba2..135eecca05 100644
--- a/plugins/connection-types/vastbase.yaml
+++ b/plugins/connection-types/vastbase.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 300
 dbType: vastbase
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Vastbase
 label: 海量 Vastbase
 dialect: Vastbase
diff --git a/plugins/connection-types/vertica.yaml b/plugins/connection-types/vertica.yaml
index 79ac745cd4..bb15beb92d 100644
--- a/plugins/connection-types/vertica.yaml
+++ b/plugins/connection-types/vertica.yaml
@@ -1,6 +1,7 @@
 schemaVersion: 1
 order: 390
 dbType: vertica
+compareModes: [schema, data]
 rustVariant: Vertica
 label: Vertica
 dialect: Vertica
diff --git a/plugins/connection-types/xugu.yaml b/plugins/connection-types/xugu.yaml
index 5500287f73..25a753a965 100644
--- a/plugins/connection-types/xugu.yaml
+++ b/plugins/connection-types/xugu.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 660
 dbType: xugu
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Xugu
 label: 虚谷 XuguDB
 dialect: Xugu
diff --git a/plugins/connection-types/yashandb.yaml b/plugins/connection-types/yashandb.yaml
index f204899174..2d68f26be3 100644
--- a/plugins/connection-types/yashandb.yaml
+++ b/plugins/connection-types/yashandb.yaml
@@ -1,6 +1,8 @@
 schemaVersion: 1
 order: 350
 dbType: yashandb
+compareModes: [schema, data]
+transferSupportLevel: best-effort
 rustVariant: Yashandb
 label: 崖山 YashanDB
 dialect: YashanDB
diff --git a/scripts/core-architecture.test.mjs b/scripts/core-architecture.test.mjs
index d2b9851d63..8446233b10 100644
--- a/scripts/core-architecture.test.mjs
+++ b/scripts/core-architecture.test.mjs
@@ -65,6 +65,7 @@ test("core owns application orchestration in real business directories", () => {
     "schema/mod.rs",
     "schema/table_structure_sql/sqlite_rebuild.rs",
     "data/transfer.rs",
+    "data/transfer_runner.rs",
     "data/table_import.rs",
     "data/docs/export.rs",
     "data/cloudflare_d1/import.rs",
@@ -88,6 +89,37 @@ test("core owns application orchestration in real business directories", () => {
   assert.ok(!existsSync(path.join(root, "crates/dbx-core/build.rs")));
 });
 
+test("transfer entrypoints delegate orchestration to the core runner", () => {
+  const entrypoints = [
+    "src-tauri/src/commands/transfer.rs",
+    "crates/dbx-web/src/routes/transfer.rs",
+  ];
+  const orchestrationCalls = [
+    "rename_tables_to_backup",
+    "transfer_postgres_schema_dependencies",
+    "clear_foreign_key_linked_overwrite_targets",
+    "transfer_table_with_result",
+    "transfer_schema_objects",
+    "drop_backup_tables",
+  ];
+
+  for (const entrypoint of entrypoints) {
+    const source = read(entrypoint);
+    assert.match(source, /transfer_runner::run_transfer\(/, `${entrypoint} must use the shared transfer runner`);
+    for (const call of orchestrationCalls) {
+      const directCall = new RegExp(`(?:dbx_core::)?transfer::${call}\\(`);
+      assert.doesNotMatch(source, directCall, `${entrypoint} must not own ${call} orchestration`);
+    }
+  }
+});
+
+test("database comparison admission comes from the shared driver manifest", () => {
+  const source = read("apps/desktop/src/lib/database/databaseCompareCapabilities.ts");
+  assert.match(source, /supportsDatabaseCompareMode\(type, mode\)/);
+  assert.doesNotMatch(source, /new Set<DatabaseType>/);
+  assert.doesNotMatch(source, /SQL_COMPARE_TYPES/);
+});
+
 test("core forwards capability flags without enabling driver defaults or test hooks", () => {
   for (const feature of ["duckdb-sidecar", "dynamodb", "mq-admin", "sqlite-bundled", "sqlite-sqlcipher", "sqlite-multiple-ciphers"]) {
     assert.ok(core.features[feature].includes(`dbx-drivers/${feature}`), `missing driver forwarding for ${feature}`);
diff --git a/scripts/sync-connection-types.mjs b/scripts/sync-connection-types.mjs
index cdb4be00ec..d176d7c4a3 100644
--- a/scripts/sync-connection-types.mjs
+++ b/scripts/sync-connection-types.mjs
@@ -15,12 +15,18 @@ const checkOnly = process.argv.includes("--check");
 const runtimeModes = new Set(["native", "file", "agent", "external"]);
 const mcpModes = new Set(["direct", "bridge", "unsupported"]);
 const supportLevels = new Set(["connect", "browse", "understand", "operate"]);
+const transferObjectFamilies = new Set(["mysql", "postgres", "oracle", "sqlserver"]);
+const transferSupportLevels = new Set(["verified", "family-compatible", "best-effort"]);
+const compareModes = new Set(["schema", "data"]);
 const formKinds = new Set(["standard", "jdbc", "mq", "mqtt", "nacos"]);
 const profileCategories = new Set(["sql", "analytics", "domestic", "lightweight", "document", "graph_ai", "timeseries", "mq", "registry_config"]);
 const descriptorKeys = new Set([
   "schemaVersion",
   "order",
   "dbType",
+  "compareModes",
+  "transferObjectFamily",
+  "transferSupportLevel",
   "rustVariant",
   "label",
   "dialect",
@@ -95,6 +101,18 @@ function validateDescriptor(descriptor, file, knownDialects) {
   if (descriptor.schemaVersion !== 1) throw new Error(`${location}: schemaVersion must be 1`);
   if (!Number.isInteger(descriptor.order) || descriptor.order <= 0) throw new Error(`${location}: order must be a positive integer`);
   if (!/^[a-z0-9]+(?:-[a-z0-9]+)*$/.test(descriptor.dbType ?? "")) throw new Error(`${location}: invalid dbType`);
+  if (descriptor.compareModes !== undefined) {
+    if (!Array.isArray(descriptor.compareModes) || descriptor.compareModes.length === 0 || descriptor.compareModes.some((mode) => !compareModes.has(mode))) {
+      throw new Error(`${location}: invalid compareModes`);
+    }
+    if (new Set(descriptor.compareModes).size !== descriptor.compareModes.length) throw new Error(`${location}: duplicate compareModes`);
+  }
+  if (descriptor.transferObjectFamily !== undefined && !transferObjectFamilies.has(descriptor.transferObjectFamily)) {
+    throw new Error(`${location}: invalid transferObjectFamily`);
+  }
+  if (descriptor.transferSupportLevel !== undefined && !transferSupportLevels.has(descriptor.transferSupportLevel)) {
+    throw new Error(`${location}: invalid transferSupportLevel`);
+  }
   if (!/^[A-Z][A-Za-z0-9]*$/.test(descriptor.rustVariant ?? "")) throw new Error(`${location}: invalid rustVariant`);
   if (typeof descriptor.label !== "string" || descriptor.label.trim() === "") throw new Error(`${location}: label is required`);
   if (!runtimeModes.has(descriptor.runtimeMode)) throw new Error(`${location}: invalid runtimeMode`);
@@ -109,6 +127,18 @@ function validateDescriptor(descriptor, file, knownDialects) {
   }
   if (!descriptor.capabilities || typeof descriptor.capabilities !== "object") throw new Error(`${location}: capabilities are required`);
   validateBooleanMap(descriptor.capabilities, capabilityKeys, `${location}: capabilities`, true);
+  if (descriptor.capabilities.dataTransfer !== (descriptor.transferSupportLevel !== undefined)) {
+    throw new Error(`${location}: transferSupportLevel must be set exactly when dataTransfer is true`);
+  }
+  if (descriptor.compareModes?.includes("schema") && !descriptor.capabilities.metadataBrowse) {
+    throw new Error(`${location}: schema comparison requires metadataBrowse`);
+  }
+  if (descriptor.compareModes?.includes("data") && (!descriptor.capabilities.metadataBrowse || !descriptor.capabilities.queryExecution)) {
+    throw new Error(`${location}: data comparison requires metadataBrowse and queryExecution`);
+  }
+  if (descriptor.transferSupportLevel === "family-compatible" && descriptor.transferObjectFamily === undefined) {
+    throw new Error(`${location}: family-compatible transfer support requires transferObjectFamily`);
+  }
   if (!Object.values(descriptor.capabilities).some(Boolean) && descriptor.specializedSurface !== true) {
     throw new Error(`${location}: enable a product capability or set specializedSurface: true`);
   }
diff --git a/src-tauri/src/commands/transfer.rs b/src-tauri/src/commands/transfer.rs
index 72f43a594f..62b1cacaf9 100644
--- a/src-tauri/src/commands/transfer.rs
+++ b/src-tauri/src/commands/transfer.rs
@@ -5,12 +5,8 @@ use crate::commands::connection::{ensure_connection_writable, AppState};
 
 // Re-export types and functions used by other modules
 use dbx_core::models::connection::DatabaseType;
-use dbx_core::persistence::task_history::{
-    TaskHistoryStorageError, TaskItemStatus, TaskLifecycleOwner, TransferTaskJournal,
-};
-pub use dbx_core::transfer::{
-    get_db_type, TransferOwnershipPreview, TransferProgress, TransferRequest, TransferStatus,
-};
+use dbx_core::persistence::task_history::{TaskHistoryStorageError, TaskLifecycleOwner, TransferTaskJournal};
+pub use dbx_core::transfer::{get_db_type, TransferOwnershipPreview, TransferProgress, TransferRequest};
 
 fn emit_progress(app: &AppHandle, progress: TransferProgress) {
     let _ = app.emit("transfer-progress", progress);
@@ -30,8 +26,6 @@ pub async fn start_transfer(
     request: TransferRequest,
 ) -> Result<(), String> {
     let state = state.inner().clone();
-    let transfer_id = request.transfer_id.clone();
-
     // Reject transfer early if the target connection is read-only — writing to it is inherently required
     ensure_connection_writable(&state, &request.target_connection_id, "Transfer").await?;
 
@@ -88,527 +82,18 @@ pub async fn start_transfer(
     };
 
     tokio::spawn(async move {
-        // Sort tables by FK dependency so referenced tables are transferred first,
-        // and keep the foreign key metadata fetched along the way — MySQL-family
-        // targets reuse it per table below instead of re-querying it.
-        // Skip for external Doris/StarRocks catalogs — the database name does not
-        // exist in the default catalog and sorting is unnecessary (no FK constraints).
-        let (sorted_tables, known_foreign_keys) = {
-            let skip_fk_sort = {
-                let configs = state.configs.read().await;
-                configs
-                    .get(&request.source_connection_id)
-                    .and_then(|config| {
-                        dbx_core::transfer::resolve_external_transfer_catalog_for_config(
-                            request.source_catalog.as_deref(),
-                            config,
-                        )
-                    })
-                    .is_some()
-            };
-            if skip_fk_sort {
-                (request.tables.clone(), std::collections::HashMap::new())
-            } else {
-                dbx_core::transfer::sort_tables_by_fk_dependency_with_foreign_keys(
-                    &state,
-                    &request.source_connection_id,
-                    &request.source_database,
-                    &request.source_schema,
-                    &request.tables,
-                    true,
-                )
-                .await
-                .unwrap_or_else(|e| {
-                    log::warn!("[transfer] failed to sort tables by FK dependency, using original order: {e}");
-                    (request.tables.clone(), std::collections::HashMap::new())
-                })
-            }
-        };
-
-        let total_tables = sorted_tables.len();
-        log::info!("[transfer] starting transfer_id={} tables={}", transfer_id, total_tables);
-
-        let mut failed_tables: Vec<String> = Vec::new();
-        let mut pending_fk_alters: Vec<(String, String)> = Vec::new();
-        let mut last_rows_transferred = 0_u64;
-        let mut last_total_rows = None;
-
-        // When drop_target_before_create is true, perform a rename pre-pass in
-        // parents_first=false order (children first) so that foreign keys on the
-        // backup tables remain intact. The main create/insert pass then runs in
-        // parents_first=true order (parents first).
-        // Children-first order used by the rename pre-pass, kept for the post-loop backup
-        // cleanup: a backup can still be referenced by another backup, so the drops must
-        // follow the same order.
-        let mut backup_drop_order: Vec<String> = Vec::new();
-        let backup_names = if request.drop_target_before_create {
-            // Re-sort tables in children-first order for the rename pre-pass
-            let (tables_for_rename, _) = dbx_core::transfer::sort_tables_by_fk_dependency_with_foreign_keys(
-                &state,
-                &request.target_connection_id,
-                &request.target_database,
-                &request.target_schema,
-                &sorted_tables,
-                false, // parents_first=false: children first
-            )
-            .await
-            .unwrap_or_else(|e| {
-                log::warn!("[transfer] failed to sort tables for rename pre-pass, using original order: {e}");
-                (sorted_tables.clone(), std::collections::HashMap::new())
-            });
-            backup_drop_order = tables_for_rename.clone();
-
-            match dbx_core::transfer::rename_tables_to_backup(
-                &state,
-                &request,
-                &tables_for_rename,
-                target_db_type,
-                &target_pool_key,
-                |progress| {
-                    last_rows_transferred = progress.rows_transferred;
-                    last_total_rows = progress.total_rows;
-                    emit_progress(&app, progress);
-                },
-            )
-            .await
-            {
-                Ok(names) => Some(names),
-                Err(e) if e == "Cancelled" => {
-                    emit_terminal_progress(
-                        &app,
-                        history.as_ref(),
-                        TransferProgress {
-                            transfer_id: transfer_id.clone(),
-                            table: "rename pre-pass".to_string(),
-                            table_index: 0,
-                            total_tables,
-                            rows_transferred: last_rows_transferred,
-                            total_rows: last_total_rows,
-                            status: TransferStatus::Cancelled,
-                            error: None,
-                            terminal: true,
-                        },
-                    )
-                    .await;
-                    dbx_core::transfer::clear_cancelled(&transfer_id).await;
-                    return;
-                }
-                Err(e) => {
-                    emit_terminal_progress(
-                        &app,
-                        history.as_ref(),
-                        TransferProgress {
-                            transfer_id: transfer_id.clone(),
-                            table: "rename pre-pass".to_string(),
-                            table_index: 0,
-                            total_tables,
-                            rows_transferred: last_rows_transferred,
-                            total_rows: last_total_rows,
-                            status: TransferStatus::Error,
-                            error: Some(e),
-                            terminal: true,
-                        },
-                    )
-                    .await;
-                    dbx_core::transfer::clear_cancelled(&transfer_id).await;
-                    return;
-                }
-            }
-        } else {
-            None
-        };
-
-        if matches!(source_db_type, dbx_core::models::connection::DatabaseType::Postgres)
-            && matches!(target_db_type, dbx_core::models::connection::DatabaseType::Postgres)
-        {
-            match dbx_core::transfer::transfer_postgres_schema_dependencies(
-                &state,
-                &request,
-                &source_pool_key,
-                &target_pool_key,
-                |progress| {
-                    last_rows_transferred = progress.rows_transferred;
-                    last_total_rows = progress.total_rows;
-                    emit_progress(&app, progress);
-                },
-            )
-            .await
-            {
-                Ok(()) => {}
-                Err(e) if e == "Cancelled" => {
-                    emit_terminal_progress(
-                        &app,
-                        history.as_ref(),
-                        TransferProgress {
-                            transfer_id: transfer_id.clone(),
-                            table: "schema dependencies".to_string(),
-                            table_index: 0,
-                            total_tables,
-                            rows_transferred: last_rows_transferred,
-                            total_rows: last_total_rows,
-                            status: TransferStatus::Cancelled,
-                            error: None,
-                            terminal: true,
-                        },
-                    )
-                    .await;
-                    dbx_core::transfer::clear_cancelled(&transfer_id).await;
-                    return;
-                }
-                Err(e) => {
-                    emit_terminal_progress(
-                        &app,
-                        history.as_ref(),
-                        TransferProgress {
-                            transfer_id: transfer_id.clone(),
-                            table: "schema dependencies".to_string(),
-                            table_index: 0,
-                            total_tables,
-                            rows_transferred: last_rows_transferred,
-                            total_rows: last_total_rows,
-                            status: TransferStatus::Error,
-                            error: Some(e),
-                            terminal: true,
-                        },
-                    )
-                    .await;
-                    dbx_core::transfer::clear_cancelled(&transfer_id).await;
-                    return;
-                }
-            }
-        }
-        // Overwrite clears each target right before copying it, parents first, which cannot
-        // clear a table another selected table references. Empty those children first now.
-        let overwrite_cleared = match dbx_core::transfer::clear_foreign_key_linked_overwrite_targets(
-            &state,
-            &request,
-            &sorted_tables,
+        let terminal = dbx_core::transfer_runner::run_transfer(
+            state,
+            request,
+            source_db_type,
             target_db_type,
-            &target_pool_key,
-        )
-        .await
-        {
-            Ok(cleared) => cleared,
-            Err(e) => {
-                emit_terminal_progress(
-                    &app,
-                    history.as_ref(),
-                    TransferProgress {
-                        transfer_id: transfer_id.clone(),
-                        table: "overwrite pre-pass".to_string(),
-                        table_index: 0,
-                        total_tables,
-                        rows_transferred: last_rows_transferred,
-                        total_rows: last_total_rows,
-                        status: TransferStatus::Error,
-                        error: Some(e),
-                        terminal: true,
-                    },
-                )
-                .await;
-                dbx_core::transfer::clear_cancelled(&transfer_id).await;
-                return;
-            }
-        };
-
-        for (i, table) in sorted_tables.iter().enumerate() {
-            if dbx_core::transfer::is_cancelled(&transfer_id).await {
-                emit_terminal_progress(
-                    &app,
-                    history.as_ref(),
-                    TransferProgress {
-                        transfer_id: transfer_id.clone(),
-                        table: table.clone(),
-                        table_index: i,
-                        total_tables,
-                        rows_transferred: last_rows_transferred,
-                        total_rows: last_total_rows,
-                        status: TransferStatus::Cancelled,
-                        error: None,
-                        terminal: true,
-                    },
-                )
-                .await;
-                dbx_core::transfer::clear_cancelled(&transfer_id).await;
-                return;
-            }
-
-            log::info!("[transfer] table {}/{}: {}", i + 1, total_tables, table);
-            let history_item_index =
-                history.as_ref().and_then(|journal| journal.item_index_for_table(table)).unwrap_or(i);
-            if let Some(journal) = history.as_ref() {
-                journal.start_table(history_item_index).await;
-            }
-            let mut source_row_count = None;
-            let mut moved_row_count = None;
-            let history_for_progress = history.as_ref();
-            let history_for_count = history.as_ref();
-            let result = dbx_core::transfer::transfer_table_with_result(
-                &state,
-                &request,
-                table,
-                i,
-                &source_db_type,
-                &target_db_type,
-                &source_pool_key,
-                &target_pool_key,
-                &known_foreign_keys,
-                &mut pending_fk_alters,
-                backup_names.as_ref(),
-                overwrite_cleared.contains(table),
-                |progress| {
-                    last_rows_transferred = progress.rows_transferred;
-                    last_total_rows = progress.total_rows;
-                    moved_row_count = Some(progress.rows_transferred);
-                    if let Some(journal) = history_for_progress {
-                        journal.observe_table_progress(history_item_index, progress.rows_transferred);
-                    }
-                    emit_progress(&app, progress);
-                },
-                |source_count| {
-                    source_row_count = source_count;
-                    if let Some(journal) = history_for_count {
-                        journal.observe_source_count(history_item_index, source_count);
-                    }
-                },
-            )
-            .await;
-            match result {
-                Ok(result) => {
-                    if let Some(journal) = history.as_ref() {
-                        journal
-                            .finish_table(
-                                history_item_index,
-                                TaskItemStatus::Succeeded,
-                                result.source_row_count,
-                                Some(result.moved_rows),
-                            )
-                            .await;
-                    }
-                    emit_progress(
-                        &app,
-                        TransferProgress {
-                            transfer_id: transfer_id.clone(),
-                            table: table.clone(),
-                            table_index: i,
-                            total_tables,
-                            rows_transferred: result.moved_rows,
-                            total_rows: last_total_rows.or(Some(result.moved_rows)),
-                            status: TransferStatus::TableDone,
-                            error: None,
-                            terminal: false,
-                        },
-                    );
-                }
-                Err(e) => {
-                    if e == "Cancelled" {
-                        if let Some(journal) = history.as_ref() {
-                            journal
-                                .finish_table(
-                                    history_item_index,
-                                    TaskItemStatus::Cancelled,
-                                    source_row_count,
-                                    moved_row_count,
-                                )
-                                .await;
-                        }
-                        emit_terminal_progress(
-                            &app,
-                            history.as_ref(),
-                            TransferProgress {
-                                transfer_id: transfer_id.clone(),
-                                table: table.clone(),
-                                table_index: i,
-                                total_tables,
-                                rows_transferred: 0,
-                                total_rows: None,
-                                status: TransferStatus::Cancelled,
-                                error: None,
-                                terminal: true,
-                            },
-                        )
-                        .await;
-                        dbx_core::transfer::clear_cancelled(&transfer_id).await;
-                        return;
-                    }
-                    if let Some(journal) = history.as_ref() {
-                        journal
-                            .finish_table(history_item_index, TaskItemStatus::Failed, source_row_count, moved_row_count)
-                            .await;
-                    }
-                    failed_tables.push(table.clone());
-                    emit_progress(
-                        &app,
-                        TransferProgress {
-                            transfer_id: transfer_id.clone(),
-                            table: table.clone(),
-                            table_index: i,
-                            total_tables,
-                            rows_transferred: last_rows_transferred,
-                            total_rows: last_total_rows,
-                            status: TransferStatus::Error,
-                            error: Some(e),
-                            terminal: false,
-                        },
-                    );
-                }
-            }
-        }
-
-        // Add any foreign keys deferred during MySQL-family table creation now that
-        // every selected table exists — see transfer_table's use of
-        // strip_inline_foreign_key_constraint_lines for why these can't be created
-        // inline (a foreign key cycle has no valid CREATE TABLE order at all). The
-        // rename pre-pass already freed the backup constraint names, so these re-create
-        // the original names without colliding.
-        let mut failed_fk_tables: Vec<String> = Vec::new();
-        let mut failed_fk_count = 0usize;
-        for (table, alter_sql) in &pending_fk_alters {
-            if let Err(e) = dbx_core::transfer::execute_on_pool(&state, &target_pool_key, alter_sql).await {
-                log::warn!("[transfer] failed to add deferred foreign key constraint for {table}: {e}");
-                failed_fk_count += 1;
-                failed_fk_tables.push(table.clone());
-            }
-        }
-        if failed_fk_count > 0 {
-            failed_fk_tables.sort();
-            failed_fk_tables.dedup();
-            failed_tables.push(format!("{} foreign key(s) on: {}", failed_fk_count, failed_fk_tables.join(", ")));
-        }
-
-        // Transfer selected non-table objects (views, procedures, functions,
-        // triggers, sequences, events) after the per-table loop. The shared
-        // Core decision handles all content modes: DataOnly never
-        // transfers schema objects; PG→PG keeps the legacy empty-selection
-        // default only when structure participates in the transfer.
-        let mut object_outcome = dbx_core::transfer::TransferObjectOutcome::default();
-        match dbx_core::transfer::transfer_schema_objects(
-            &state,
-            &request,
-            &source_pool_key,
-            &target_pool_key,
+            source_pool_key,
+            target_pool_key,
+            history.clone(),
             |progress| emit_progress(&app, progress),
         )
-        .await
-        {
-            Ok(outcome) => {
-                if let Some(journal) = history.as_ref() {
-                    journal.record_object_outcome(&outcome).await;
-                }
-                object_outcome = outcome;
-            }
-            Err(e) if e == "Cancelled" => {
-                if let Some(journal) = history.as_ref() {
-                    journal.record_schema_objects_error(true).await;
-                }
-                emit_terminal_progress(
-                    &app,
-                    history.as_ref(),
-                    TransferProgress {
-                        transfer_id: transfer_id.clone(),
-                        table: "schema objects".to_string(),
-                        table_index: total_tables,
-                        total_tables,
-                        rows_transferred: 0,
-                        total_rows: None,
-                        status: TransferStatus::Cancelled,
-                        error: None,
-                        terminal: true,
-                    },
-                )
-                .await;
-                dbx_core::transfer::clear_cancelled(&transfer_id).await;
-                return;
-            }
-            Err(e) => {
-                if let Some(journal) = history.as_ref() {
-                    journal.record_schema_objects_error(false).await;
-                }
-                failed_tables.push("schema objects".to_string());
-                emit_progress(
-                    &app,
-                    TransferProgress {
-                        transfer_id: transfer_id.clone(),
-                        table: "schema objects".to_string(),
-                        table_index: total_tables,
-                        total_tables,
-                        rows_transferred: 0,
-                        total_rows: None,
-                        status: TransferStatus::Error,
-                        error: Some(e),
-                        terminal: false,
-                    },
-                );
-            }
-        }
-        if !object_outcome.failed.is_empty() {
-            failed_tables.push(format!("schema objects ({})", object_outcome.failed.len()));
-        }
-
-        // The rename pre-pass left one backup per rebuilt table. Drop them only now that
-        // every table, every deferred foreign key and every selected schema object has
-        // succeeded — a failure anywhere above keeps the originals recoverable under
-        // their backup names.
-        if let Some(backup_names) = backup_names.as_ref() {
-            if failed_tables.is_empty() {
-                if let Err(e) = dbx_core::transfer::drop_backup_tables(
-                    &state,
-                    &request,
-                    target_db_type,
-                    &target_pool_key,
-                    backup_names,
-                    &backup_drop_order,
-                )
-                .await
-                {
-                    failed_tables.push(e);
-                }
-            } else {
-                log::warn!(
-                    "[transfer] keeping {} backup table(s) because {} step(s) failed",
-                    backup_names.len(),
-                    failed_tables.len()
-                );
-            }
-        }
-        let skip_suffix = if !object_outcome.skipped.is_empty() && failed_tables.is_empty() {
-            format!("，跳过 {} 个已存在对象", object_outcome.skipped.len())
-        } else if !object_outcome.skipped.is_empty() {
-            format!("；跳过 {} 个已存在对象", object_outcome.skipped.len())
-        } else {
-            String::new()
-        };
-
-        emit_terminal_progress(
-            &app,
-            history.as_ref(),
-            TransferProgress {
-                transfer_id: transfer_id.clone(),
-                table: String::new(),
-                table_index: total_tables,
-                total_tables,
-                rows_transferred: last_rows_transferred,
-                total_rows: last_total_rows,
-                status: if failed_tables.is_empty() { TransferStatus::Done } else { TransferStatus::Error },
-                error: if failed_tables.is_empty() {
-                    if skip_suffix.is_empty() {
-                        None
-                    } else {
-                        Some(skip_suffix.clone())
-                    }
-                } else {
-                    Some(format!(
-                        "{} table(s) failed: {}{}",
-                        failed_tables.len(),
-                        failed_tables.iter().take(5).cloned().collect::<Vec<_>>().join(", "),
-                        skip_suffix
-                    ))
-                },
-                terminal: true,
-            },
-        )
         .await;
-        dbx_core::transfer::clear_cancelled(&transfer_id).await;
+        emit_terminal_progress(&app, history.as_ref(), terminal).await;
     });
 
     Ok(())