fix(peewee): enable WAL journal mode for SQLite (#132)

* fix(peewee): enable WAL journal mode for SQLite

PeeweeStorage was using SQLite's default DELETE journal mode, while
SqliteStorage already had WAL enabled. Without WAL, concurrent read/write
access from threaded Flask causes frequent "database is locked" errors,
leading to 500 responses and watcher retry storms.

* fix: remove unnecessary wal_autocheckpoint override

SQLite's default of 1000 pages is fine; setting 100 would cause more
frequent checkpointing and unnecessary IO.

Author: ErikBjare

aw_datastore/storages/peewee.py

@@ -146,7 +146,9 @@ def __init__(self, testing: bool = True, filepath: Optional[str] = None) -> None
             )
             filepath = os.path.join(data_dir, filename)
         self.db = _db
-        self.db.init(filepath)
+        self.db.init(filepath, pragmas={
+            "journal_mode": "wal",
+        })
         logger.info(f"Using database file: {filepath}")
         self.db.connect()