feat(database): implement version management and migration checks during initialization

crawl4ai/version_manager.py

@@ -0,0 +1,30 @@
+# version_manager.py
+import os
+from pathlib import Path
+from packaging import version
+from . import __version__
+
+class VersionManager:
+    def __init__(self):
+        self.home_dir = Path.home() / ".crawl4ai"
+        self.version_file = self.home_dir / "version.txt"
+        
+    def get_installed_version(self):
+        """Get the version recorded in home directory"""
+        if not self.version_file.exists():
+            return None
+        try:
+            return version.parse(self.version_file.read_text().strip())
+        except:
+            return None
+            
+    def update_version(self):
+        """Update the version file to current library version"""
+        self.version_file.write_text(__version__)
+        
+    def needs_update(self):
+        """Check if database needs update based on version"""
+        installed = self.get_installed_version()
+        current = version.parse(__version__)
+        return installed is None or installed < current
+