fix(GRO-2139): serialize reset→migrate→seed under the seed advisory lock (#160)

Serialize the entire db:reset chain (DROP → migrate → seed) inside one withSeedAdvisoryLock callback so a concurrent same-PRNG seeder cannot interleave and collide on invoices_pkey. Pool sized max:6 (1 reserved for the lock + work headroom) to avoid the connection-starvation deadlock the CTO caught. Verified with three end-to-end live db:reset runs against a throwaway Postgres.

cc @cpfarhood

packages/db/package.json

@@ -21,7 +21,7 @@
     "wait-for-db": "node ./scripts/wait-for-db.mjs",
     "migrate": "node ./scripts/wait-for-db.mjs && drizzle-kit migrate",
     "seed": "node ./scripts/wait-for-db.mjs && tsx src/seed.ts",
-    "reset": "node ./scripts/wait-for-db.mjs && tsx src/reset.ts && drizzle-kit migrate && tsx src/seed.ts",
+    "reset": "node ./scripts/wait-for-db.mjs && tsx src/reset.ts",
     "studio": "drizzle-kit studio",
     "typecheck": "tsc --noEmit"
   },

packages/db/src/reset.ts

@@ -1,13 +1,52 @@
 /**
- * reset.ts — Drop all application tables and re-run migrations + seed.
+ * reset.ts — Drop all application tables, re-run migrations, and re-seed.
  *
  * Intended for local development only. Never run against production.
  *
  * Usage:
  *   DATABASE_URL=postgres://... npx tsx packages/db/src/reset.ts
+ *
+ * GRO-2139: the entire drop→migrate→seed chain runs inside a single
+ * Postgres advisory lock (SEED_ADVISORY_LOCK_KEY) so a concurrent
+ * `seed.ts` (e.g. the dev `seed-test-data-*` Job being recreated at
+ * the top of the hour) cannot interleave between `reset.ts` (DROP)
+ * and `seed.ts` (TRUNCATE+insert) and collide on `invoices_pkey`.
+ *
+ * Why this matters: `seed.ts` derives every primary key from a single
+ * shared Mulberry32 PRNG seeded with 42 (see `createPrng(42)` and
+ * `uuid()` in seed.ts). Two concurrent same-profile seeders therefore
+ * emit *identical* ids for the same logical row, and any moment
+ * between a concurrent `seed.ts` TRUNCATE and INSERT is exactly the
+ * window in which the second seeder's INSERT can hit a pkey already
+ * taken by the first. Pre-GRO-2123 this raced unconditionally;
+ * GRO-2123 added the advisory lock around `runSeedBody` but left
+ * `reset.ts` and `drizzle-kit migrate` outside the lock. This script
+ * now wraps the *whole* chain in the same lock: `withSeedAdvisoryLock`
+ * pins the lock to one reserved session and the DROP → migrate → seed
+ * work runs on the rest of the pool, so the lock guarantees mutual
+ * exclusion against any concurrent seeder for the entire chain.
+ *
+ * See: groombook/infra `apps/base/reset-cronjob.yaml` (CronJob) and
+ * `apps/base/seed-job.yaml` (one-shot Job) — both invoke the same
+ * `seed.ts` code path on the same database in `groombook-dev`.
  */
-
 import postgres from "postgres";
+import { drizzle } from "drizzle-orm/postgres-js";
+import { migrate } from "drizzle-orm/postgres-js/migrator";
+import { fileURLToPath } from "node:url";
+import { dirname, resolve } from "node:path";
+import * as schema from "./schema.js";
+import {
+  SEED_ADVISORY_LOCK_KEY,
+  withSeedAdvisoryLock,
+  getProfile,
+  runSeedBody,
+  profiles,
+} from "./seed.js";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+const MIGRATIONS_FOLDER = resolve(__dirname, "../migrations");
 
 async function reset() {
   const url = process.env.DATABASE_URL;
@@ -16,52 +55,88 @@ async function reset() {
     process.exit(1);
   }
 
-  if (process.env.NODE_ENV === "production" && process.env.ALLOW_RESET !== "true") {
-    console.error("[FATAL] db:reset must not be run in production without ALLOW_RESET=true.");
+  if (
+    process.env.NODE_ENV === "production" &&
+    process.env.ALLOW_RESET !== "true"
+  ) {
+    console.error(
+      "[FATAL] db:reset must not be run in production without ALLOW_RESET=true.",
+    );
     process.exit(1);
   }
 
-  const client = postgres(url, { max: 1 });
+  // Pool sizing is load-bearing here. `withSeedAdvisoryLock` does
+  // `pool.reserve()` to pin the advisory lock to one dedicated session
+  // (a session-level lock released on a *different* pooled connection is
+  // a no-op), and the DROP / migrate / seed work then runs on the
+  // *remaining* pooled connections. The lock provides mutual exclusion
+  // across processes regardless of how many connections the work uses —
+  // it does NOT require the work to share the lock's session.
+  //
+  // Therefore `max` must be ≥ 2: 1 reserved for the lock + ≥1 free for
+  // the work. `max: 1` would let `reserve()` consume the only connection
+  // and every query inside the callback would block forever waiting for
+  // a connection that never frees (connection-starvation deadlock). We
+  // use `max: 6` to match `seed()`'s headroom (1 reserved + 5 work).
+  const client = postgres(url, { max: 6 });
+  const db = drizzle(client, { schema });
 
-  console.log("Dropping all application tables...\n");
+  try {
+    await withSeedAdvisoryLock(client, async () => {
+      console.log("Dropping all application tables...\n");
 
-  // Drop in dependency order (children before parents)
-  await client`
-    DO $$ DECLARE
-      r RECORD;
-    BEGIN
-      FOR r IN (
-        SELECT tablename FROM pg_tables
-        WHERE schemaname = 'public'
-      ) LOOP
-        EXECUTE 'DROP TABLE IF EXISTS public.' || quote_ident(r.tablename) || ' CASCADE';
-      END LOOP;
-    END $$;
-  `;
+      // Drop dependencies (tables) first
+      await client`
+        DO $$ DECLARE
+          r RECORD;
+        BEGIN
+          FOR r IN (
+            SELECT tablename FROM pg_tables
+            WHERE schemaname = 'public'
+          ) LOOP
+            EXECUTE 'DROP TABLE IF EXISTS public.' || quote_ident(r.tablename) || ' CASCADE';
+          END LOOP;
+        END $$;
+      `;
 
-  // Drop custom enums
-  await client`
-    DO $$ DECLARE
-      r RECORD;
-    BEGIN
-      FOR r IN (
-        SELECT typname FROM pg_type
-        WHERE typtype = 'e' AND typnamespace = (
-          SELECT oid FROM pg_namespace WHERE nspname = 'public'
-        )
-      ) LOOP
-        EXECUTE 'DROP TYPE IF EXISTS ' || quote_ident(r.typname) || ' CASCADE';
-      END LOOP;
-    END $$;
-  `;
+      // Drop custom enums
+      await client`
+        DO $$ DECLARE
+          r RECORD;
+        BEGIN
+          FOR r IN (
+            SELECT typname FROM pg_type
+            WHERE typtype = 'e' AND typnamespace = (
+              SELECT oid FROM pg_namespace WHERE nspname = 'public'
+            )
+          ) LOOP
+            EXECUTE 'DROP TYPE IF EXISTS ' || quote_ident(r.typname) || ' CASCADE';
+          END LOOP;
+        END $$;
+      `;
 
-  // Drop the drizzle migrations tracking table
-  await client`DROP TABLE IF EXISTS drizzle.__drizzle_migrations CASCADE`;
-  await client`DROP SCHEMA IF EXISTS drizzle CASCADE`;
+      // Drop the drizzle migrations tracking table
+      await client`DROP TABLE IF EXISTS drizzle.__drizzle_migrations CASCADE`;
+      await client`DROP SCHEMA IF EXISTS drizzle CASCADE`;
 
-  console.log("✓ All tables and enums dropped\n");
+      console.log("✓ All tables and enums dropped\n");
 
-  await client.end();
+      console.log("Running migrations...");
+      await migrate(db, { migrationsFolder: MIGRATIONS_FOLDER });
+      console.log("✓ Migrations applied\n");
+
+      console.log("Seeding database...");
+      const profile = getProfile();
+      const cfg = profiles[profile];
+      await runSeedBody(client, db, profile, cfg);
+    });
+
+    console.log(
+      `\n✓ Reset complete (advisory lock key=0x${SEED_ADVISORY_LOCK_KEY.toString(16)})`,
+    );
+  } finally {
+    await client.end();
+  }
 }
 
 reset().catch((err) => {

packages/db/src/seed.ts

@@ -24,9 +24,9 @@ import type { MedicalAlert } from "@groombook/types";
 
 // ── Seed profile configuration ─────────────────────────────────────────────
 
-type SeedProfile = "dev" | "uat" | "demo";
+export type SeedProfile = "dev" | "uat" | "demo";
 
-interface ProfileConfig {
+export interface ProfileConfig {
   staffCount: { manager: number; receptionist: number; groomer: number; bather: number };
   clientCount: number;
   appointmentsBackDays: number;
@@ -35,7 +35,7 @@ interface ProfileConfig {
   includeUatClients: boolean;
 }
 
-const profiles: Record<SeedProfile, ProfileConfig> = {
+export const profiles: Record<SeedProfile, ProfileConfig> = {
   dev: {
     staffCount: { manager: 1, receptionist: 1, groomer: 2, bather: 0 },
     clientCount: 100,
@@ -70,6 +70,8 @@ function getProfile(): SeedProfile {
   return "uat";
 }
 
+export { getProfile };
+
 // ── Deterministic PRNG (Mulberry32) ──────────────────────────────────────────
 
 /**
@@ -1194,7 +1196,7 @@ async function seedKnownUsers() {
 // from runbooks without ambiguity and binds to the single-argument
 // `pg_advisory_lock(int)` form, which postgres-js serializes as a plain
 // number (no bigint type plumbing required).
-const SEED_ADVISORY_LOCK_KEY = 0x47524f4f; // "GROO" in ASCII — arbitrary, stable
+export const SEED_ADVISORY_LOCK_KEY = 0x47524f4f; // "GROO" in ASCII — arbitrary, stable
 
 /**
  * Reserve a dedicated connection from `pool`, take the seed advisory lock
@@ -1207,7 +1209,7 @@ const SEED_ADVISORY_LOCK_KEY = 0x47524f4f; // "GROO" in ASCII — arbitrary, sta
  * for the lock and release it from the same reserved connection. The
  * seed work itself still runs on the pooled connections.
  */
-async function withSeedAdvisoryLock<T>(
+export async function withSeedAdvisoryLock<T>(
   pool: ReturnType<typeof postgres>,
   fn: () => Promise<T>,
 ): Promise<T> {
@@ -1265,7 +1267,7 @@ async function seed() {
   await client.end();
 }
 
-async function runSeedBody(
+export async function runSeedBody(
   client: ReturnType<typeof postgres>,
   db: ReturnType<typeof drizzle>,
   profile: SeedProfile,