refactor(core): декомпозиция db_cli, сервисный дамп БД и зачистка контекста

modules/web_api/llm/db/db_chat.py

@@ -53,4 +53,36 @@ def db_clear_chat_history(session_id: str) -> None:
     cursor = conn.cursor()
     cursor.execute("DELETE FROM chat_messages WHERE session_id = ?", (session_id,))
     conn.commit()
-    conn.close()
+    conn.close()
+
+def db_clear_all_chat_context(session_id: str = None, purge_all: bool = False) -> int:
+    """Удаляет сообщения чата и стейты сессий."""
+    with get_db_connection() as conn:
+        cursor = conn.cursor()
+        if purge_all:
+            if session_id:
+                cursor.execute("DELETE FROM chat_messages WHERE session_id = ?", (session_id,))
+                cursor.execute("DELETE FROM session_states WHERE session_id = ?", (session_id,))
+            else:
+                cursor.execute("DELETE FROM chat_messages")
+                cursor.execute("DELETE FROM session_states")
+            cnt = cursor.rowcount
+            conn.commit()
+            return cnt
+
+        query = """
+            DELETE FROM chat_messages 
+            WHERE is_ephemeral = 1 
+               OR content LIKE '%Предпросмотр изменений%'
+               OR content LIKE '%Удален пункт:%'
+               OR content LIKE '%добавлен пункт:%'
+        """
+        if session_id:
+            cursor.execute(query + " AND session_id = ?", (session_id,))
+            cursor.execute("DELETE FROM session_states WHERE session_id = ?", (session_id,))
+        else:
+            cursor.execute(query)
+            cursor.execute("DELETE FROM session_states")
+        cnt = cursor.rowcount
+        conn.commit()
+        return cnt