From 601f5ddfe49f93d989a7a1edd73b5d580b20ebfa Mon Sep 17 00:00:00 2001
From: Gerald Leban <gerald.leban0@gmail.com>
Date: Sat, 10 Oct 2026 10:31:21 +0200
Subject: [PATCH] perf(database): configure sqlite WAL mode, normal
 synchronous, and 5s busy timeout

---
 config/database.ts              |  9 +++++++++
 tests/unit/database_wal.spec.ts | 20 ++++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 tests/unit/database_wal.spec.ts

diff --git a/config/database.ts b/config/database.ts
index d4a5f55..a0bd5ed 100644
--- a/config/database.ts
+++ b/config/database.ts
@@ -21,6 +21,15 @@ const dbConfig = defineConfig({
         filename: app.tmpPath('db.sqlite3'),
       },
 
+      pool: {
+        afterCreate: (conn: any, done: any) => {
+          conn.pragma('journal_mode = WAL')
+          conn.pragma('synchronous = NORMAL')
+          conn.pragma('busy_timeout = 5000')
+          done(null, conn)
+        },
+      },
+
       /**
        * Required by Knex for SQLite defaults.
        */
diff --git a/tests/unit/database_wal.spec.ts b/tests/unit/database_wal.spec.ts
new file mode 100644
index 0000000..92f722b
--- /dev/null
+++ b/tests/unit/database_wal.spec.ts
@@ -0,0 +1,20 @@
+import { test } from '@japa/runner'
+import db from '@adonisjs/lucid/services/db'
+
+test.group('SQLite WAL Concurrency', () => {
+  test('verifies connection enables WAL mode, normal synchronous, and 5000ms busy timeout', async ({
+    assert,
+  }) => {
+    const journalModeResult = await db.rawQuery('PRAGMA journal_mode;')
+    const busyTimeoutResult = await db.rawQuery('PRAGMA busy_timeout;')
+    const synchronousResult = await db.rawQuery('PRAGMA synchronous;')
+
+    const journalMode = (journalModeResult[0]?.journal_mode ?? '').toLowerCase()
+    const busyTimeout = Number(busyTimeoutResult[0]?.timeout)
+    const synchronous = Number(synchronousResult[0]?.synchronous)
+
+    assert.equal(journalMode, 'wal')
+    assert.equal(busyTimeout, 5000)
+    assert.equal(synchronous, 1)
+  })
+})
-- 
2.54.0