fix: refresh metadata after schema changes

tests/sqlMetadataRefresh.test.ts

@@ -0,0 +1,26 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { sqlMetadataRefreshScope } from "../src/lib/sqlMetadataRefresh.ts";
+
+test("database DDL refreshes the connection database list", () => {
+  assert.equal(sqlMetadataRefreshScope("CREATE DATABASE app;"), "connection");
+  assert.equal(sqlMetadataRefreshScope("drop schema public cascade;"), "connection");
+});
+
+test("object DDL refreshes the selected database tree", () => {
+  assert.equal(sqlMetadataRefreshScope("CREATE TABLE users (id int);"), "database");
+  assert.equal(sqlMetadataRefreshScope("CREATE TEMP TABLE scratch (id int);"), "database");
+  assert.equal(sqlMetadataRefreshScope("CREATE MATERIALIZED VIEW daily_users AS SELECT 1;"), "database");
+  assert.equal(sqlMetadataRefreshScope("ALTER TABLE users ADD COLUMN name text;"), "database");
+  assert.equal(sqlMetadataRefreshScope("DROP VIEW active_users;"), "database");
+  assert.equal(
+    sqlMetadataRefreshScope("CREATE OR REPLACE FUNCTION f() RETURNS int AS $$ SELECT 1 $$ LANGUAGE SQL;"),
+    "database",
+  );
+});
+
+test("data-only SQL does not refresh metadata trees", () => {
+  assert.equal(sqlMetadataRefreshScope("SELECT * FROM users;"), "none");
+  assert.equal(sqlMetadataRefreshScope("INSERT INTO users VALUES (1);"), "none");
+  assert.equal(sqlMetadataRefreshScope("TRUNCATE TABLE users;"), "none");
+});