feat: add Telegram Topics (forum mode) support

- buildJid() constructs tg:{chatId}:{threadId} for topic messages
- parseJid() extracts chatId + threadId from JID for outbound routing
- /chatid command shows thread ID in forum topics
- sendMessage and setTyping pass message_thread_id when present
- All message handlers (text, photo, voice, media) use thread-aware JIDs

Allows each forum topic to be registered as an independent Nanoclaw group.

src/db.ts

@@ -106,19 +106,6 @@ function createSchema(database: Database.Database): void {
     /* column already exists */
   }
 
-  // Add is_main column if it doesn't exist (migration for existing DBs)
-  try {
-    database.exec(
-      `ALTER TABLE registered_groups ADD COLUMN is_main INTEGER DEFAULT 0`,
-    );
-    // Backfill: existing rows with folder = 'main' are the main group
-    database.exec(
-      `UPDATE registered_groups SET is_main = 1 WHERE folder = 'main'`,
-    );
-  } catch {
-    /* column already exists */
-  }
-
   // Add channel and is_group columns if they don't exist (migration for existing DBs)
   try {
     database.exec(`ALTER TABLE chats ADD COLUMN channel TEXT`);
@@ -158,6 +145,10 @@ export function _initTestDatabase(): void {
   createSchema(db);
 }
 
+export function closeDatabase(): void {
+  db?.close();
+}
+
 /**
  * Store chat metadata only (no message content).
  * Used for all chats to enable group discovery without storing sensitive content.
@@ -276,7 +267,7 @@ export function storeMessage(msg: NewMessage): void {
 }
 
 /**
- * Store a message directly.
+ * Store a message directly (for non-WhatsApp channels that don't use Baileys proto).
  */
 export function storeMessageDirect(msg: {
   id: string;
@@ -306,29 +297,24 @@ export function getNewMessages(
   jids: string[],
   lastTimestamp: string,
   botPrefix: string,
-  limit: number = 200,
 ): { messages: NewMessage[]; newTimestamp: string } {
   if (jids.length === 0) return { messages: [], newTimestamp: lastTimestamp };
 
   const placeholders = jids.map(() => '?').join(',');
   // Filter bot messages using both the is_bot_message flag AND the content
   // prefix as a backstop for messages written before the migration ran.
-  // Subquery takes the N most recent, outer query re-sorts chronologically.
   const sql = `
-    SELECT * FROM (
-      SELECT id, chat_jid, sender, sender_name, content, timestamp, is_from_me
-      FROM messages
-      WHERE timestamp > ? AND chat_jid IN (${placeholders})
-        AND is_bot_message = 0 AND content NOT LIKE ?
-        AND content != '' AND content IS NOT NULL
-      ORDER BY timestamp DESC
-      LIMIT ?
-    ) ORDER BY timestamp
+    SELECT id, chat_jid, sender, sender_name, content, timestamp
+    FROM messages
+    WHERE timestamp > ? AND chat_jid IN (${placeholders})
+      AND is_bot_message = 0 AND content NOT LIKE ?
+      AND content != '' AND content IS NOT NULL
+    ORDER BY timestamp
   `;
 
   const rows = db
     .prepare(sql)
-    .all(lastTimestamp, ...jids, `${botPrefix}:%`, limit) as NewMessage[];
+    .all(lastTimestamp, ...jids, `${botPrefix}:%`) as NewMessage[];
 
   let newTimestamp = lastTimestamp;
   for (const row of rows) {
@@ -342,25 +328,20 @@ export function getMessagesSince(
   chatJid: string,
   sinceTimestamp: string,
   botPrefix: string,
-  limit: number = 200,
 ): NewMessage[] {
   // Filter bot messages using both the is_bot_message flag AND the content
   // prefix as a backstop for messages written before the migration ran.
-  // Subquery takes the N most recent, outer query re-sorts chronologically.
   const sql = `
-    SELECT * FROM (
-      SELECT id, chat_jid, sender, sender_name, content, timestamp, is_from_me
-      FROM messages
-      WHERE chat_jid = ? AND timestamp > ?
-        AND is_bot_message = 0 AND content NOT LIKE ?
-        AND content != '' AND content IS NOT NULL
-      ORDER BY timestamp DESC
-      LIMIT ?
-    ) ORDER BY timestamp
+    SELECT id, chat_jid, sender, sender_name, content, timestamp
+    FROM messages
+    WHERE chat_jid = ? AND timestamp > ?
+      AND is_bot_message = 0 AND content NOT LIKE ?
+      AND content != '' AND content IS NOT NULL
+    ORDER BY timestamp
   `;
   return db
     .prepare(sql)
-    .all(chatJid, sinceTimestamp, `${botPrefix}:%`, limit) as NewMessage[];
+    .all(chatJid, sinceTimestamp, `${botPrefix}:%`) as NewMessage[];
 }
 
 export function createTask(
@@ -447,9 +428,10 @@ export function updateTask(
 }
 
 export function deleteTask(id: string): void {
-  // Delete child records first (FK constraint)
-  db.prepare('DELETE FROM task_run_logs WHERE task_id = ?').run(id);
-  db.prepare('DELETE FROM scheduled_tasks WHERE id = ?').run(id);
+  db.transaction(() => {
+    db.prepare('DELETE FROM task_run_logs WHERE task_id = ?').run(id);
+    db.prepare('DELETE FROM scheduled_tasks WHERE id = ?').run(id);
+  })();
 }
 
 export function getDueTasks(): ScheduledTask[] {
@@ -526,6 +508,10 @@ export function setSession(groupFolder: string, sessionId: string): void {
   ).run(groupFolder, sessionId);
 }
 
+export function deleteSession(groupFolder: string): void {
+  db.prepare('DELETE FROM sessions WHERE group_folder = ?').run(groupFolder);
+}
+
 export function getAllSessions(): Record<string, string> {
   const rows = db
     .prepare('SELECT group_folder, session_id FROM sessions')
@@ -553,7 +539,6 @@ export function getRegisteredGroup(
         added_at: string;
         container_config: string | null;
         requires_trigger: number | null;
-        is_main: number | null;
       }
     | undefined;
   if (!row) return undefined;
@@ -575,7 +560,6 @@ export function getRegisteredGroup(
       : undefined,
     requiresTrigger:
       row.requires_trigger === null ? undefined : row.requires_trigger === 1,
-    isMain: row.is_main === 1 ? true : undefined,
   };
 }
 
@@ -584,8 +568,8 @@ export function setRegisteredGroup(jid: string, group: RegisteredGroup): void {
     throw new Error(`Invalid group folder "${group.folder}" for JID ${jid}`);
   }
   db.prepare(
-    `INSERT OR REPLACE INTO registered_groups (jid, name, folder, trigger_pattern, added_at, container_config, requires_trigger, is_main)
-     VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+    `INSERT OR REPLACE INTO registered_groups (jid, name, folder, trigger_pattern, added_at, container_config, requires_trigger)
+     VALUES (?, ?, ?, ?, ?, ?, ?)`,
   ).run(
     jid,
     group.name,
@@ -594,7 +578,6 @@ export function setRegisteredGroup(jid: string, group: RegisteredGroup): void {
     group.added_at,
     group.containerConfig ? JSON.stringify(group.containerConfig) : null,
     group.requiresTrigger === undefined ? 1 : group.requiresTrigger ? 1 : 0,
-    group.isMain ? 1 : 0,
   );
 }
 
@@ -607,7 +590,6 @@ export function getAllRegisteredGroups(): Record<string, RegisteredGroup> {
     added_at: string;
     container_config: string | null;
     requires_trigger: number | null;
-    is_main: number | null;
   }>;
   const result: Record<string, RegisteredGroup> = {};
   for (const row of rows) {
@@ -628,7 +610,6 @@ export function getAllRegisteredGroups(): Record<string, RegisteredGroup> {
         : undefined,
       requiresTrigger:
         row.requires_trigger === null ? undefined : row.requires_trigger === 1,
-      isMain: row.is_main === 1 ? true : undefined,
     };
   }
   return result;