read log files from end, added user management

server/db_py.py

@@ -452,6 +452,43 @@ def create_user(username, password_hash, role="viewer", is_active=1):
     return cursor.lastrowid
 
 
+def update_user_password(user_id, password_hash):
+    with _tx():
+        cursor = _conn.execute(
+            """
+            UPDATE users
+            SET password_hash = ?
+            WHERE id = ?
+            """,
+            (password_hash, user_id),
+        )
+    return cursor.rowcount
+
+
+def delete_user(user_id):
+    with _tx():
+        cursor = _conn.execute(
+            """
+            DELETE FROM users
+            WHERE id = ?
+            """,
+            (user_id,),
+        )
+    return cursor.rowcount
+
+
+def count_admin_users():
+    with _lock:
+        row = _conn.execute(
+            """
+            SELECT COUNT(*) AS n
+            FROM users
+            WHERE role = 'admin' AND is_active = 1
+            """
+        ).fetchone()
+    return row["n"]
+
+
 def count_users():
     with _lock:
         row = _conn.execute("SELECT COUNT(*) AS n FROM users").fetchone()