fix(db): resolve 077 migration version collision blocking getDbInstance

077_api_key_stream_default_mode.sql and 077_quota_pools.sql both claimed
prefix 077, so getMigrationFiles() threw a version-collision error and
getDbInstance() failed at every startup (app would not boot; all DB-touching
unit tests were red on release/v3.8.8).

Renumber the dependency-free, idempotent quota_pools migration 077 -> 085
(no other migration references quota_pools/quota_allocations), keep the
non-idempotent api_key_stream_default_mode ALTER at 077, add a retroactive
isSchemaAlreadyApplied guard (case 085) for DBs that already applied it under
077, and add a regression test enforcing unique migration prefixes.

CHANGELOG.md

@@ -53,6 +53,17 @@
   `INSPECTOR_TLS_INTERCEPT`, `INSPECTOR_SYSTEM_PROXY_GUARD_MINUTES`, `INSPECTOR_MAX_BODY_KB`,
   `INSPECTOR_MASK_SECRETS`, `INSPECTOR_LLM_HOSTS_EXTRA`, `INSPECTOR_INTERNAL_INGEST_TOKEN`).
 
+### Fixed
+
+- **db/migrations:** resolve a `077` migration version collision
+  (`077_api_key_stream_default_mode.sql` vs `077_quota_pools.sql`) that made
+  `getMigrationFiles()` throw and blocked `getDbInstance()` at startup (app would
+  not boot; every DB-touching test was red). Renumbered the dependency-free,
+  idempotent `quota_pools` migration to `085`, kept the non-idempotent
+  `api_key_stream_default_mode` `ALTER` at `077`, added a retroactive
+  `isSchemaAlreadyApplied` guard (case `085`), and a regression test enforcing
+  unique migration prefixes.
+
 ### ✨ New Features
 
 - **notion:** add Notion as an MCP context source — 6 tools (`notion_search`, `notion_list_databases`, `notion_get_database`, `notion_query_database`, `notion_read`, `notion_append_blocks`) scoped under `read:notion` / `write:notion`, with dashboard "Context Sources" tab, settings API, and token persistence in `key_value` table (#2959)

src/lib/db/migrationRunner.ts

@@ -444,6 +444,11 @@ function isSchemaAlreadyApplied(
       // mid-file and skip the CREATE INDEX that follows, leaving the index
       // missing on DBs that re-execute the script after a partial first run.
       return hasColumn(db, "memories", "needs_reindex");
+    case "085":
+      // Retroactive guard for quota_pools migration renumbered from 077 → 085
+      // (077 collided with 077_api_key_stream_default_mode). DBs that already
+      // applied quota_pools under the old 077 number should not re-run as 085.
+      return hasTable(db, "quota_pools") && hasTable(db, "quota_allocations");
     default:
       return false;
   }

src/lib/db/migrations/085_quota_pools.sql

@@ -1,4 +1,12 @@
--- Migration 073: quota_pools + quota_allocations
+-- Migration 085: quota_pools + quota_allocations
+--
+-- Renumbered from 077 → 085 (#2900 sibling fix): 077 collided with
+-- 077_api_key_stream_default_mode.sql, which made getMigrationFiles() throw a
+-- version-collision error and blocked getDbInstance() at startup. quota_pools
+-- has no dependents (no other migration references these tables) and is fully
+-- idempotent, so it can safely move to the next free number. DBs that already
+-- applied it under the old 077 number are guarded in isSchemaAlreadyApplied
+-- (case "085").
 --
 -- Creates the two tables that persist quota-sharing pools and per-API-key
 -- allocations within each pool. Idempotent: safe to run more than once.

tests/unit/db-migration-version-uniqueness.test.ts

@@ -0,0 +1,68 @@
+/**
+ * Regression guard for the migration version collision that blocked
+ * release/v3.8.8: `077_api_key_stream_default_mode.sql` and `077_quota_pools.sql`
+ * both claimed prefix 077. getMigrationFiles() throws on such a collision, which
+ * made getDbInstance() fail at startup and turned every DB-touching test red.
+ *
+ * quota_pools was renumbered 077 → 085 (it is dependency-free and idempotent;
+ * api_key_stream_default_mode is a non-idempotent ALTER and stays at 077).
+ *
+ * This test asserts — purely from the filesystem, without booting the DB — that
+ * no two live migration files share a numeric prefix (mirroring the runner's
+ * own collision check, minus any SUPERSEDED_DUPLICATE_MIGRATIONS allowlisted
+ * renamed pairs). It prevents the collision from being reintroduced.
+ */
+import test from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const MIGRATIONS_DIR = path.join(
+  path.dirname(fileURLToPath(import.meta.url)),
+  "..",
+  "..",
+  "src",
+  "lib",
+  "db",
+  "migrations"
+);
+
+function migrationFiles(): Array<{ version: string; name: string }> {
+  return fs
+    .readdirSync(MIGRATIONS_DIR)
+    .filter((f) => f.endsWith(".sql"))
+    .map((filename) => {
+      const m = filename.match(/^(\d+)_(.+)\.sql$/);
+      return m ? { version: m[1], name: m[2] } : null;
+    })
+    .filter((x): x is { version: string; name: string } => x !== null);
+}
+
+test("no two migration files share the same numeric prefix", () => {
+  const byVersion = new Map<string, string[]>();
+  for (const f of migrationFiles()) {
+    if (!byVersion.has(f.version)) byVersion.set(f.version, []);
+    byVersion.get(f.version)!.push(f.name);
+  }
+  const collisions = [...byVersion.entries()]
+    .filter(([, names]) => names.length > 1)
+    .map(([version, names]) => `${version} → [${names.join(", ")}]`);
+  assert.deepEqual(
+    collisions,
+    [],
+    `Migration version collision(s) detected: ${collisions.join("; ")}. ` +
+      `Each migration must have a unique numeric prefix (rename to the next free number).`
+  );
+});
+
+test("quota_pools lives at 085 (renumbered from the 077 collision)", () => {
+  const files = migrationFiles();
+  const quotaPools = files.find((f) => f.name === "quota_pools");
+  assert.ok(quotaPools, "quota_pools migration must exist");
+  assert.equal(quotaPools.version, "085", "quota_pools must be renumbered to 085");
+  // The standalone, non-idempotent column add stays at 077.
+  const streamDefault = files.find((f) => f.name === "api_key_stream_default_mode");
+  assert.ok(streamDefault, "api_key_stream_default_mode migration must exist");
+  assert.equal(streamDefault.version, "077", "api_key_stream_default_mode stays at 077");
+});