fix(db): индексировать историю для очистки планировщика

backend/src/db/scheduler-retention-index.test.ts

@@ -0,0 +1,33 @@
+import assert from "node:assert/strict"
+import { readFileSync } from "node:fs"
+import pg from "pg"
+import { env } from "../config.js"
+
+// No bootstrap/migrations against public tables: this test needs only a connection.
+const pool = new pg.Pool({ connectionString: env.DATABASE_URL, connectionTimeoutMillis: 8000, statement_timeout: 10000 })
+try {
+  const client = await pool.connect()
+  try {
+    await client.query("BEGIN")
+    // Temporary shadow table: public scheduler history is never changed.
+    await client.query("CREATE TEMP TABLE scheduler_runs(id integer PRIMARY KEY, finished_at timestamptz NOT NULL) ON COMMIT DROP")
+    await client.query(`INSERT INTO scheduler_runs SELECT i, now() - CASE WHEN i=1 THEN interval '60 days' ELSE i * interval '1 second' END FROM generate_series(1,20000) AS i`)
+    await client.query("ANALYZE scheduler_runs")
+    const cutoff = new Date(Date.now() - 30 * 86400_000).toISOString()
+    const plan = async () => JSON.stringify((await client.query("EXPLAIN (FORMAT JSON) SELECT id FROM scheduler_runs WHERE finished_at < $1", [cutoff])).rows)
+    assert.match(await plan(), /Seq Scan/)
+    const migration = readFileSync(new URL("../../drizzle/0013_scheduler_retention_index.sql", import.meta.url), "utf8")
+    await client.query(migration)
+    await client.query(migration)
+    assert.match(await plan(), /Index Scan|Bitmap Index Scan/)
+    assert.deepEqual((await client.query("SELECT id FROM scheduler_runs WHERE finished_at < $1", [cutoff])).rows, [{ id: 1 }])
+    const index = (await client.query("SELECT indisvalid FROM pg_index WHERE indrelid = 'pg_temp.scheduler_runs'::regclass AND indexrelid::regclass::text LIKE '%idx_scheduler_runs_finished_at'")).rows
+    assert.deepEqual(index, [{ indisvalid: true }])
+    console.log("Scheduler retention: actual migration/idempotence/valid index/selective plan/result preservation passed on 20,000 temporary rows")
+  } finally {
+    await client.query("ROLLBACK")
+    client.release()
+  }
+} finally {
+  await pool.end()
+}

backend/src/db/schema.ts

@@ -649,6 +649,7 @@ export const schedulerRuns = pgTable("scheduler_runs", {
   resultJson:  jsonb("result_json"),
 }, (t) => [
   index("idx_scheduler_runs_job_time").on(t.jobKey, t.startedAt),
+  index("idx_scheduler_runs_finished_at").on(t.finishedAt),
 ])
 
 export const events = pgTable("events", {