fix: enable sqlite wal mode and default rate limit

Author: a1denvalu3

cashu/core/db.py

@@ -151,9 +151,11 @@ def _set_sqlite_pragma(dbapi_connection, connection_record):
                 try:
                     cursor = dbapi_connection.cursor()
                     cursor.execute("PRAGMA foreign_keys=ON;")
+                    cursor.execute("PRAGMA journal_mode=WAL;")
+                    cursor.execute("PRAGMA busy_timeout=5000;")
                     cursor.close()
                 except Exception as e:
-                    logger.warning(f"Could not enable SQLite PRAGMA foreign_keys: {e}")
+                    logger.warning(f"Could not enable SQLite PRAGMAs: {e}")
 
         self.async_session = sessionmaker(
             self.engine,  # type: ignore

cashu/core/settings.py

@@ -107,7 +107,7 @@ class MintBackends(MintSettings):
 
 class MintLimits(MintSettings):
     mint_rate_limit: bool = Field(
-        default=False, title="Rate limit", description="IP-based rate limiter."
+        default=True, title="Rate limit", description="IP-based rate limiter."
     )
     mint_global_rate_limit_per_minute: int = Field(
         default=60,