feat: enable SQLite WAL mode for all databases (AGI ticket #1) (#153)

tests/spark/test_spark.py

@@ -473,3 +473,40 @@ class TestSparkRoutes:
     def test_spark_insights(self, client):
         resp = client.get("/spark/insights")
         assert resp.status_code == 200
+
+
+# ── WAL Mode ──────────────────────────────────────────────────────────────
+
+
+class TestWALMode:
+    """Verify SQLite WAL mode is enabled for all Spark databases."""
+
+    def test_spark_memory_uses_wal(self):
+        from spark.memory import _get_conn
+
+        conn = _get_conn()
+        try:
+            mode = conn.execute("PRAGMA journal_mode").fetchone()[0]
+            assert mode == "wal", f"Expected WAL mode, got {mode}"
+        finally:
+            conn.close()
+
+    def test_spark_eidos_uses_wal(self):
+        from spark.eidos import _get_conn
+
+        conn = _get_conn()
+        try:
+            mode = conn.execute("PRAGMA journal_mode").fetchone()[0]
+            assert mode == "wal", f"Expected WAL mode, got {mode}"
+        finally:
+            conn.close()
+
+    def test_spark_memory_busy_timeout(self):
+        from spark.memory import _get_conn
+
+        conn = _get_conn()
+        try:
+            timeout = conn.execute("PRAGMA busy_timeout").fetchone()[0]
+            assert timeout == 5000
+        finally:
+            conn.close()