feat(lotto-agent): get_agent_tasks 필터 + get_tasks_by_agent_date_kind 멱등 guard

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent-office/app/db.py

@@ -236,12 +236,24 @@ def get_task(task_id: str) -> Optional[Dict[str, Any]]:
     return _task_to_dict(r) if r else None
 
 
-def get_agent_tasks(agent_id: str, limit: int = 20) -> List[Dict[str, Any]]:
+def get_agent_tasks(
+    agent_id: str,
+    limit: int = 20,
+    task_type: Optional[str] = None,
+    days: Optional[int] = None,
+) -> List[Dict[str, Any]]:
+    sql = "SELECT * FROM agent_tasks WHERE agent_id=?"
+    params: List[Any] = [agent_id]
+    if task_type is not None:
+        sql += " AND task_type=?"
+        params.append(task_type)
+    if days is not None and days > 0:
+        sql += " AND created_at >= datetime('now', ?)"
+        params.append(f"-{int(days)} days")
+    sql += " ORDER BY created_at DESC LIMIT ?"
+    params.append(limit)
     with _conn() as conn:
-        rows = conn.execute(
-            "SELECT * FROM agent_tasks WHERE agent_id=? ORDER BY created_at DESC LIMIT ?",
-            (agent_id, limit),
-        ).fetchall()
+        rows = conn.execute(sql, params).fetchall()
     return [_task_to_dict(r) for r in rows]
 
 
@@ -739,3 +751,18 @@ def get_all_baselines() -> List[Dict[str, Any]]:
         d["window_values"] = json.loads(d["window_values"])
         out.append(d)
     return out
+
+
+def get_tasks_by_agent_date_kind(agent_id: str, date_iso: str, task_type: str) -> List[Dict[str, Any]]:
+    """같은 (agent, date, task_type)으로 이미 생성된 task 조회. 멱등 guard."""
+    with _conn() as conn:
+        rows = conn.execute(
+            """
+            SELECT * FROM agent_tasks
+            WHERE agent_id = ? AND task_type = ?
+              AND substr(created_at, 1, 10) = ?
+            ORDER BY created_at DESC
+            """,
+            (agent_id, task_type, date_iso),
+        ).fetchall()
+    return [_task_to_dict(r) for r in rows]