fix: IMAP sync - use imap_uid, add sync queue with retry, restore deleted on sync, upload sent mails

- imap_delete_mail: use stored imap_uid instead of Message-ID search, raise on failure
- imap_move_mail: same imap_uid fix, raise on failure
- New MailSyncQueue model + migration 0007 for pending IMAP operations
- delete_mail route: queues failed IMAP delete for retry
- move_mail route: queues failed IMAP move for retry
- process_sync_queue: retries pending delete/move operations in auto-sync loop
- Auto-sync loop: processes sync queue before pulling new mails
- Restore soft-deleted mails if they still exist on IMAP server during sync
- Upload sent mails to IMAP Sent folder via APPEND after SMTP send
- Plugin version bumped to 1.2.0

app/plugins/builtins/mail/models.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import uuid
-from datetime import datetime
+from datetime import UTC, datetime
 
 from sqlalchemy import (
     Boolean,
@@ -11,6 +11,7 @@ from sqlalchemy import (
     ForeignKey,
     Index,
     Integer,
+    JSON,
     String,
     Text,
     UniqueConstraint,
@@ -415,3 +416,30 @@ class ContactPgpKey(Base, TenantMixin):
     contact_id: Mapped[uuid.UUID] = mapped_column(PGUUID(as_uuid=True), nullable=False)
     public_key_armored: Mapped[str] = mapped_column(Text, nullable=False)
     key_id: Mapped[str] = mapped_column(String(255), nullable=False, default="")
+
+
+class MailSyncQueue(Base, TenantMixin):
+    """Queue for pending IMAP operations that need retry."""
+
+    __tablename__ = "mail_sync_queue"
+    __table_args__ = (
+        Index("ix_mail_sync_queue_status", "status"),
+        Index("ix_mail_sync_queue_mail", "mail_id"),
+    )
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    mail_id: Mapped[uuid.UUID] = mapped_column(PGUUID(as_uuid=True), nullable=False)
+    operation: Mapped[str] = mapped_column(String(50), nullable=False)
+    payload: Mapped[dict] = mapped_column(JSON, nullable=False, default=dict)
+    status: Mapped[str] = mapped_column(String(20), nullable=False, default="pending")
+    attempts: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    max_attempts: Mapped[int] = mapped_column(Integer, nullable=False, default=3)
+    last_error: Mapped[str | None] = mapped_column(Text, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, default=lambda: datetime.now(UTC)
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), nullable=False, default=lambda: datetime.now(UTC)
+    )