email: store emails.db per account under email_accounts/<account>/

Reorganizes email storage: the DB moves from DATA_PATH/<user>/emails.db to
DATA_PATH/<user>/email_accounts/<accountEmail>/emails.db, with a shared
email_accounts/attachment_cache/ (was Gmail/emails/attachments). openEmailDb now
takes (owner, account); a new openUserEmailDb(owner, userId) resolves the user's
configured account (first enabled) for read paths. Threads the account through
email.ts, accounts, resync, queue sync, channel handlers, and the email_db MCP
tool path. Drops the dead getUserEmailDir helper.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/servers/channels/discord/handler.ts

@@ -6,7 +6,7 @@ import { chunkMessage } from './chunker';
 import { listPiModels } from '@@/api/pi/list-models';
 import { enqueueJob } from '../../queue/init';
 import { readJob } from '@@/queue/storage';
-import { openEmailDb } from '@@/api/email/email-db';
+import { openUserEmailDb } from '@@/api/email/email-db';
 import type { ModelInfo } from '@@/api/pi/types';
 import { toShellUsername } from '@@/data-path';
 
@@ -45,15 +45,17 @@ type CommandContext = {
 };
 
 async function handleEmailSync(ctx: CommandContext): Promise<void> {
-  const { channel, email } = ctx;
+  const { channel, email, userId } = ctx;
 
   // Count emails before sync
   let countBefore = 0;
   try {
-    const db = openEmailDb(email);
-    const row = db.query('SELECT COUNT(*) as count FROM emails WHERE deleted = 0').get() as { count: number };
-    countBefore = row.count;
-    db.close();
+    const db = await openUserEmailDb(email, userId);
+    if (db) {
+      const row = db.query('SELECT COUNT(*) as count FROM emails WHERE deleted = 0').get() as { count: number };
+      countBefore = row.count;
+      db.close();
+    }
   } catch {
     // DB might not exist yet
   }
@@ -84,7 +86,8 @@ async function handleEmailSync(ctx: CommandContext): Promise<void> {
 
   // Count emails after sync and get newest ones
   try {
-    const db = openEmailDb(email);
+    const db = await openUserEmailDb(email, userId);
+    if (!db) return;
     const row = db.query('SELECT COUNT(*) as count FROM emails WHERE deleted = 0').get() as { count: number };
     const countAfter = row.count;
     const newCount = countAfter - countBefore;

src/servers/channels/telegram/handler.ts

@@ -7,7 +7,7 @@ import { getTelegramBot } from './bot';
 import { listPiModels } from '@@/api/pi/list-models';
 import { enqueueJob } from '../../queue/init';
 import { readJob } from '@@/queue/storage';
-import { openEmailDb } from '@@/api/email/email-db';
+import { openUserEmailDb } from '@@/api/email/email-db';
 import type { ModelInfo } from '@@/api/pi/types';
 import { toShellUsername } from '@@/data-path';
 
@@ -46,14 +46,16 @@ type CommandContext = {
 };
 
 async function handleEmailSync(ctx: CommandContext): Promise<void> {
-  const { send, email } = ctx;
+  const { send, email, userId } = ctx;
 
   let countBefore = 0;
   try {
-    const db = openEmailDb(email);
-    const row = db.query('SELECT COUNT(*) as count FROM emails WHERE deleted = 0').get() as { count: number };
-    countBefore = row.count;
-    db.close();
+    const db = await openUserEmailDb(email, userId);
+    if (db) {
+      const row = db.query('SELECT COUNT(*) as count FROM emails WHERE deleted = 0').get() as { count: number };
+      countBefore = row.count;
+      db.close();
+    }
   } catch {
     // DB might not exist yet
   }
@@ -82,7 +84,8 @@ async function handleEmailSync(ctx: CommandContext): Promise<void> {
   }
 
   try {
-    const db = openEmailDb(email);
+    const db = await openUserEmailDb(email, userId);
+    if (!db) return;
     const row = db.query('SELECT COUNT(*) as count FROM emails WHERE deleted = 0').get() as { count: number };
     const countAfter = row.count;
     const newCount = countAfter - countBefore;

src/servers/channels/whatsapp/handler.ts

@@ -6,7 +6,7 @@ import { getWhatsAppClient } from './bot';
 import { listPiModels } from '@@/api/pi/list-models';
 import { enqueueJob } from '../../queue/init';
 import { readJob } from '@@/queue/storage';
-import { openEmailDb } from '@@/api/email/email-db';
+import { openUserEmailDb } from '@@/api/email/email-db';
 import type { ModelInfo } from '@@/api/pi/types';
 import { toShellUsername } from '@@/data-path';
 
@@ -50,14 +50,16 @@ type CommandContext = {
 };
 
 async function handleEmailSync(ctx: CommandContext): Promise<void> {
-  const { send, email } = ctx;
+  const { send, email, userId } = ctx;
 
   let countBefore = 0;
   try {
-    const db = openEmailDb(email);
-    const row = db.query('SELECT COUNT(*) as count FROM emails WHERE deleted = 0').get() as { count: number };
-    countBefore = row.count;
-    db.close();
+    const db = await openUserEmailDb(email, userId);
+    if (db) {
+      const row = db.query('SELECT COUNT(*) as count FROM emails WHERE deleted = 0').get() as { count: number };
+      countBefore = row.count;
+      db.close();
+    }
   } catch {
     // DB might not exist yet
   }
@@ -86,7 +88,8 @@ async function handleEmailSync(ctx: CommandContext): Promise<void> {
   }
 
   try {
-    const db = openEmailDb(email);
+    const db = await openUserEmailDb(email, userId);
+    if (!db) return;
     const row = db.query('SELECT COUNT(*) as count FROM emails WHERE deleted = 0').get() as { count: number };
     const countAfter = row.count;
     const newCount = countAfter - countBefore;