added gunicorn and updated to the last version of server monitorizare

Server_Monitorizare_v2/config/database_config.py

@@ -2,7 +2,8 @@
 Database configuration and connection management
 """
 import os
-from sqlalchemy import create_engine, MetaData
+import sqlite3
+from sqlalchemy import create_engine, MetaData, event
 from sqlalchemy.orm import sessionmaker
 from contextlib import contextmanager
 from app.models import Base
@@ -38,7 +39,19 @@ class DatabaseConfig:
             pool_pre_ping=True,
             connect_args={"check_same_thread": False}  # For SQLite
         )
-        
+
+        # Enable WAL mode + sane concurrency settings on each SQLite connection.
+        # WAL lets readers and writers operate concurrently, preventing
+        # 'database is locked' errors under multi-worker Gunicorn.
+        @event.listens_for(self.engine, "connect")
+        def _set_sqlite_pragma(dbapi_connection, connection_record):
+            if isinstance(dbapi_connection, sqlite3.Connection):
+                cursor = dbapi_connection.cursor()
+                cursor.execute("PRAGMA journal_mode=WAL")
+                cursor.execute("PRAGMA busy_timeout=5000")
+                cursor.execute("PRAGMA synchronous=NORMAL")
+                cursor.close()
+
         # Create session factory
         self.Session = sessionmaker(bind=self.engine)