feat(core): initial commit unified architecture (scud_ai v2.5 with modular web_api)

modules/web_api/llm/db/db_chat.py

@@ -0,0 +1,29 @@
+"""
+FILE: modules/web_api/llm/db/db_chat.py
+"""
+from typing import List, Dict, Any
+from .connection import get_db_connection
+
+def db_save_chat_message(session_id: str, role: str, content: str):
+    if not content:
+        return
+    conn = get_db_connection()
+    cursor = conn.cursor()
+    cursor.execute("""
+        INSERT INTO chat_messages (session_id, role, content, created_at)
+        VALUES (?, ?, ?, CURRENT_TIMESTAMP)
+    """, (session_id, role, content))
+    conn.commit()
+    conn.close()
+
+def db_get_chat_history(session_id: str, limit: int = 20) -> List[Dict[str, Any]]:
+    conn = get_db_connection()
+    cursor = conn.cursor()
+    cursor.execute("""
+        SELECT role, content FROM chat_messages 
+        WHERE session_id = ? 
+        ORDER BY id DESC LIMIT ?
+    """, (session_id, limit))
+    rows = cursor.fetchall()
+    conn.close()
+    return [{"role": r["role"], "content": r["content"]} for r in reversed(rows)]