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

src/spark/eidos.py

@@ -44,8 +44,9 @@ 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_predictions (
             id               TEXT PRIMARY KEY,
             task_id          TEXT NOT NULL,
@@ -56,8 +57,7 @@ def _get_conn() -> sqlite3.Connection:
             created_at       TEXT NOT NULL,
             evaluated_at     TEXT
         )
-        """
-    )
+        """)
     conn.execute("CREATE INDEX IF NOT EXISTS idx_pred_task ON spark_predictions(task_id)")
     conn.execute("CREATE INDEX IF NOT EXISTS idx_pred_type ON spark_predictions(prediction_type)")
     conn.commit()
@@ -277,8 +277,7 @@ def get_predictions(
 def get_accuracy_stats() -> dict:
     """Return aggregate accuracy statistics for the EIDOS loop."""
     conn = _get_conn()
-    row = conn.execute(
-        """
+    row = conn.execute("""
         SELECT
             COUNT(*)                          AS total_predictions,
             COUNT(evaluated_at)               AS evaluated,
@@ -286,8 +285,7 @@ def get_accuracy_stats() -> dict:
             MIN(CASE WHEN accuracy IS NOT NULL THEN accuracy END) AS min_accuracy,
             MAX(CASE WHEN accuracy IS NOT NULL THEN accuracy END) AS max_accuracy
         FROM spark_predictions
-        """
-    ).fetchone()
+        """).fetchone()
     conn.close()
 
     return {