Replace MySQL with SQLite, fix Jinja2 template syntax, and add README

app/app.py

@@ -7,8 +7,6 @@ from datetime import datetime, timezone
 from concurrent.futures import ThreadPoolExecutor, as_completed
 
 import paramiko
-import pymysql
-pymysql.install_as_MySQLdb()
 
 from flask import Flask, render_template, jsonify
 from flask_sqlalchemy import SQLAlchemy
@@ -16,12 +14,10 @@ from flask_sqlalchemy import SQLAlchemy
 logging.basicConfig(level=logging.INFO, format='%(asctime)s %(levelname)s %(message)s')
 logger = logging.getLogger(__name__)
 
+DB_PATH = '/app/data/infmap.db'
+
 app = Flask(__name__)
-app.config['SQLALCHEMY_DATABASE_URI'] = (
-    f"mysql+pymysql://{os.environ['MYSQL_USER']}:{os.environ['MYSQL_PASSWORD']}"
-    f"@{os.environ.get('MYSQL_HOST', 'db')}/{os.environ['MYSQL_DATABASE']}"
-)
-app.config['SQLALCHEMY_ENGINE_OPTIONS'] = {'pool_recycle': 280, 'pool_pre_ping': True}
+app.config['SQLALCHEMY_DATABASE_URI'] = f'sqlite:///{DB_PATH}'
 db = SQLAlchemy(app)
 
 COLLECTION_INTERVAL = int(os.environ.get('COLLECTION_INTERVAL', 300))
@@ -349,19 +345,10 @@ def usage_color(percent):
 # --- Main ---
 
 if __name__ == '__main__':
-    # Wait for database
-    for attempt in range(30):
-        try:
-            with app.app_context():
-                db.create_all()
-            logger.info("Database ready")
-            break
-        except Exception as e:
-            logger.info("Waiting for database... (%s)", e)
-            time.sleep(2)
-    else:
-        logger.error("Could not connect to database after 30 attempts")
-        exit(1)
+    os.makedirs(os.path.dirname(DB_PATH), exist_ok=True)
+    with app.app_context():
+        db.create_all()
+    logger.info("Database ready at %s", DB_PATH)
 
     # Start collector thread
     collector_thread = threading.Thread(target=collector_loop, daemon=True)