64:class GmailAccount(Base, TimestampMixin):
65-    __tablename__ = "gmail_accounts"
66-    id = Column(Integer, primary_key=True)
67-    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
68-    email = Column(String(320), nullable=False)
69-    display_name = Column(String(200), default="")
70-    status = Column(String(30), default="pending")  # pending|authorized|expired|revoked|error
71-    sending_method = Column(String(20), default="api")  # api|smtp
72-    auth_provider = Column(String(60), default="google")
73-    google_user_id = Column(String(120), default="")
74-    # Per-account config (administrator-configurable)
75-    daily_limit = Column(Integer, default=200)          # provider/configured daily cap
76-    campaign_limit = Column(Integer, default=200)       # per-account per-campaign cap
77-    sends_today = Column(Integer, default=0)
78-    last_send_date = Column(DateTime(timezone=True))
79-    cooldown_until = Column(DateTime(timezone=True))
80-    last_success_at = Column(DateTime(timezone=True))
81-    last_error = Column(Text, default="")
82-    error_count = Column(Integer, default=0)
83-    token_expiry = Column(DateTime(timezone=True))
84-    # Imported client config reference (optional; may use server-level config)
85-    oauth_config_id = Column(Integer, ForeignKey("oauth_client_configs.id", ondelete="SET NULL"))
86-    # Encrypted SMTP OAuth2 credentials mirror (kept in oauth_tokens; this is metadata only)
87-    is_active = Column(Boolean, default=True, nullable=False)
88-    revoked_by_user = Column(Boolean, default=False)
89-    revoked_at = Column(DateTime(timezone=True))
90-
91-    user = relationship("User", back_populates="gmail_accounts")
92-    # Eager-loaded (joined) so async endpoints/workers can read account.oauth_token
93-    # without triggering a lazy-load IO (which raises MissingGreenlet in async sessions).
94-    oauth_token = relationship("OAuthToken", back_populates="account", uselist=False,
95-                               cascade="all, delete-orphan", lazy="joined")
96-    oauth_config = relationship("OAuthClientConfig")
97-
98-    __table_args__ = (UniqueConstraint("user_id", "email", name="uq_gmail_account_user_email"),
99-                      Index("ix_gmail_status", "status"),)
100-
101-    def usage_summary(self):
102-        return {"daily_limit": self.daily_limit, "sends_today": self.sends_today,
103-                "campaign_limit": self.campaign_limit,
104-                "last_success_at": self.last_success_at.isoformat() if self.last_success_at else None,