Enhance bot functionality and refactor database interactions

- Added `ca-certificates` installation to Dockerfile for improved network security.
- Updated health check command in Dockerfile to include better timeout handling.
- Refactored `run_helper.py` to implement proper signal handling and logging during shutdown.
- Transitioned database operations to an asynchronous model in `async_db.py`, improving performance and responsiveness.
- Updated database schema to support new foreign key relationships and optimized indexing for better query performance.
- Enhanced various bot handlers to utilize async database methods, improving overall efficiency and user experience.
- Removed obsolete database and fix scripts to streamline the project structure.

Dockerfile.bot

@@ -29,6 +29,7 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
 RUN apt-get update && apt-get upgrade -y && apt-get install -y \
     curl \
     sqlite3 \
+    ca-certificates \
     && rm -rf /var/lib/apt/lists/* \
     && apt-get clean
 
@@ -56,15 +57,20 @@ RUN sqlite3 /app/database/tg-bot-database.db < /app/database/schema.sql && \
 # Switch to non-root user
 USER deploy
 
-# Health check
-HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
-    CMD curl -f http://localhost:8080/health || exit 1
+# Health check with better timeout handling
+HEALTHCHECK --interval=30s --timeout=15s --start-period=10s --retries=5 \
+    CMD curl -f --connect-timeout 5 --max-time 10 http://localhost:8080/health || exit 1
 
 # Expose metrics port
 EXPOSE 8080
 
-# Graceful shutdown
+# Graceful shutdown with longer timeout
 STOPSIGNAL SIGTERM
 
-# Run application
-CMD ["python", "run_helper.py"]
+# Set environment variables for better network stability
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONHASHSEED=random
+
+# Run application with proper signal handling
+CMD ["python", "-u", "run_helper.py"]