feat(backend): auto-create empty database if missing

.python-version

@@ -1 +1 @@
-3.12.4
+3.13.7

backend/cli/base.py

@@ -55,7 +55,7 @@ class NimbusFlowCLI:
         self._init_repositories()
     
     def _get_most_recent_database(self) -> Path:
-        """Get the most recent database version, or base database if no versions exist."""
+        """Get the most recent database version, or create base database if none exist."""
         versions = self.list_database_versions()
         
         if versions:
@@ -63,11 +63,31 @@ class NimbusFlowCLI:
             most_recent = versions[0]  # Already sorted newest first
             return most_recent
         else:
-            # No versions exist, use base database
+            # No versions exist, create base database if it doesn't exist
             if not self.base_db_path.exists():
-                raise CLIError(f"Base database not found: {self.base_db_path}")
+                self._create_base_database()
             return self.base_db_path
     
+    def _create_base_database(self) -> None:
+        """Create the base database from schema.sql if it doesn't exist."""
+        # Ensure the directory exists
+        self.db_dir.mkdir(parents=True, exist_ok=True)
+        
+        # Read the schema from the schema.sql file
+        schema_path = Path(__file__).parent.parent / "schema.sql"
+        if not schema_path.exists():
+            raise CLIError(f"Schema file not found: {schema_path}")
+        
+        with open(schema_path, 'r') as f:
+            schema_sql = f.read()
+        
+        # Create the database and execute the schema
+        with DatabaseConnection(self.base_db_path) as db:
+            db.executescript(schema_sql)
+        
+        print(f"{Colors.SUCCESS}Created new database:{Colors.RESET} {Colors.CYAN}{self.base_db_path.name}{Colors.RESET}")
+        print(f"{Colors.DIM}Location: {self.base_db_path}{Colors.RESET}")
+    
     def _create_versioned_database(self) -> Path:
         """Create a versioned copy from the most recent database."""
         source_db = self.db_path  # Use the most recent database as source