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

src/spark/memory.py

@@ -57,8 +57,9 @@ def _get_conn() -> sqlite3.Connection:
     DB_PATH.parent.mkdir(parents=True, exist_ok=True)
     conn = sqlite3.connect(str(DB_PATH))
     conn.row_factory = sqlite3.Row
-    conn.execute(
-        """
+    conn.execute("PRAGMA journal_mode=WAL")
+    conn.execute("PRAGMA busy_timeout=5000")
+    conn.execute("""
         CREATE TABLE IF NOT EXISTS spark_events (
             id          TEXT PRIMARY KEY,
             event_type  TEXT NOT NULL,
@@ -69,10 +70,8 @@ def _get_conn() -> sqlite3.Connection:
             importance  REAL NOT NULL DEFAULT 0.5,
             created_at  TEXT NOT NULL
         )
-        """
-    )
-    conn.execute(
-        """
+        """)
+    conn.execute("""
         CREATE TABLE IF NOT EXISTS spark_memories (
             id              TEXT PRIMARY KEY,
             memory_type     TEXT NOT NULL,
@@ -83,8 +82,7 @@ def _get_conn() -> sqlite3.Connection:
             created_at      TEXT NOT NULL,
             expires_at      TEXT
         )
-        """
-    )
+        """)
     conn.execute("CREATE INDEX IF NOT EXISTS idx_events_type ON spark_events(event_type)")
     conn.execute("CREATE INDEX IF NOT EXISTS idx_events_agent ON spark_events(agent_id)")
     conn.execute("CREATE INDEX IF NOT EXISTS idx_events_task ON spark_events(task_id)")