-- Mail sync queue table for pending IMAP operations
CREATE TABLE IF NOT EXISTS mail_sync_queue (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id UUID NOT NULL,
    mail_id UUID NOT NULL,
    operation VARCHAR(50) NOT NULL,
    payload JSONB NOT NULL DEFAULT '{}',
    status VARCHAR(20) NOT NULL DEFAULT 'pending',
    attempts INTEGER NOT NULL DEFAULT 0,
    max_attempts INTEGER NOT NULL DEFAULT 3,
    last_error TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS ix_mail_sync_queue_status ON mail_sync_queue (status);
CREATE INDEX IF NOT EXISTS ix_mail_sync_queue_mail ON mail_sync_queue (mail_id);