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e69ce6e1c6
Replace per-message database queries with batch IN-clause queries in channel message handlers. This eliminates the N+1 query pattern that caused ~102 queries per channel page load (50 messages × 2 queries each). Changes: - Add get_reactions_by_message_ids() to MessageTable: single query fetches all reactions for multiple messages using IN clause with User JOIN, returns dict[message_id, list[Reactions]] - Add get_thread_reply_counts_by_message_ids() to MessageTable: single GROUP BY aggregate query returns (count, max_created_at) per parent, replacing full object loads just to call len() - Refactor get_channel_messages(): 102 → 4 queries per page - Refactor get_pinned_channel_messages(): 22 → 3 queries per page - Refactor get_channel_thread_messages(): 53 → 4 queries per page - Refactor send_notification(): N+1 membership check → batch set lookup