perf(*): bound list queries, batch fetches, harden media downloads

backend/src/utils/read/analytics.py

@@ -33,7 +33,7 @@ async def message_volume(
 
 
 async def response_stats(
-    pool: asyncpg.Pool, account_id: int, chat_id: int
+    pool: asyncpg.Pool, account_id: int, chat_id: int, *, days: int = 365
 ) -> ResponseStats:
     self_id = await self_user_id(pool, account_id)
     rows = await pool.fetch(
@@ -43,6 +43,7 @@ async def response_stats(
         "lag(date) OVER w AS prev_date "
         "FROM messages "
         "WHERE account_id = $1 AND chat_id = $2 AND sender_id IS NOT NULL "
+        "AND date >= $4 "
         "WINDOW w AS (ORDER BY date, message_id)), "
         "resp AS ("
         "SELECT (sender_id = $3) AS is_mine, "
@@ -55,6 +56,7 @@ async def response_stats(
         account_id,
         chat_id,
         self_id,
+        datetime.now(UTC) - timedelta(days=days),
     )
     stats = ResponseStats(
         mine_median_seconds=None, mine_count=0, their_median_seconds=None, their_count=0