Record sent chats in messages repo and blur gallery by default

Threads MessagesRepository through ChatService so first outgoing chat
messages are persisted for stats, and extends the repo + DB client to
support chat-room-keyed lookups. Adds tests covering the new behavior.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/database/client.ts

@@ -98,6 +98,43 @@ export function runMigrations(db: Database.Database): void {
   // Add subreddit column to successful_messages for smarter example selection
   addColumnIfNotExists('successful_messages', 'subreddit', 'TEXT');
 
+  // Track chats sent via chat.reddit.com so dashboard stats include them.
+  addColumnIfNotExists('sent_messages', 'chat_room_id', 'TEXT');
+  db.exec(`CREATE INDEX IF NOT EXISTS idx_sent_messages_chat_room ON sent_messages(chat_room_id)`);
+
+  // Migration: Make post_id nullable in sent_messages (chat-originated rows
+  // have no associated processed_post). SQLite can't ALTER COLUMN, so recreate.
+  const sentMsgColumns = db.prepare(`PRAGMA table_info(sent_messages)`).all() as { name: string; notnull: number }[];
+  const postIdCol = sentMsgColumns.find((c) => c.name === 'post_id');
+  if (postIdCol && postIdCol.notnull === 1) {
+    db.exec(`
+      CREATE TABLE sent_messages_new (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        post_id TEXT,
+        recipient TEXT NOT NULL,
+        subject TEXT NOT NULL,
+        message TEXT NOT NULL,
+        sent_at INTEGER NOT NULL,
+        got_response INTEGER DEFAULT 0,
+        response_checked_at INTEGER,
+        strategy_id TEXT,
+        chat_room_id TEXT,
+        FOREIGN KEY (post_id) REFERENCES processed_posts(id)
+      );
+
+      INSERT INTO sent_messages_new (id, post_id, recipient, subject, message, sent_at, got_response, response_checked_at, strategy_id, chat_room_id)
+        SELECT id, post_id, recipient, subject, message, sent_at, got_response, response_checked_at, strategy_id, chat_room_id
+        FROM sent_messages;
+
+      DROP TABLE sent_messages;
+      ALTER TABLE sent_messages_new RENAME TO sent_messages;
+
+      CREATE INDEX IF NOT EXISTS idx_sent_messages_response ON sent_messages(got_response);
+      CREATE INDEX IF NOT EXISTS idx_sent_messages_recipient ON sent_messages(recipient);
+      CREATE INDEX IF NOT EXISTS idx_sent_messages_chat_room ON sent_messages(chat_room_id);
+    `);
+  }
+
   // Migration: Make sent_message_id nullable in successful_messages
   // SQLite doesn't support ALTER COLUMN, so we need to recreate the table
   const successfulMsgColumns = db.prepare(`PRAGMA table_info(successful_messages)`).all() as { name: string; notnull: number }[];