Fix notification System

worker/app/models.py

@@ -22,7 +22,7 @@ from sqlalchemy import (
     ARRAY, BigInteger, Boolean, DateTime, Enum, ForeignKey,
     Integer, String, Text, func,
 )
-from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.dialects.postgresql import JSONB, UUID
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
 
@@ -202,3 +202,127 @@ class Attachment(Base):
 
     # Relazione inversa verso Message
     message: Mapped["Message"] = relationship("Message", back_populates="attachments")
+
+
+# ─── Modelli Notifiche ────────────────────────────────────────────────────────
+
+NotifChannelType = Enum(
+    "webhook", "email", "telegram", "whatsapp",
+    name="notification_channel_type",
+    create_type=False,
+)
+
+NotifStatus = Enum(
+    "pending", "sent", "failed", "skipped",
+    name="notification_status",
+    create_type=False,
+)
+
+
+class NotificationChannel(Base):
+    """
+    Canale di notifica configurato da un tenant.
+    Corrisponde alla tabella `notification_channels` nel DB.
+    """
+
+    __tablename__ = "notification_channels"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    tenant_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
+    name: Mapped[str] = mapped_column(String(255), nullable=False)
+    channel_type: Mapped[str] = mapped_column(NotifChannelType, nullable=False)
+    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
+    config: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
+    config_enc: Mapped[str | None] = mapped_column(Text, nullable=True)
+    consecutive_failures: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    circuit_open_until: Mapped[datetime | None] = mapped_column(
+        DateTime(timezone=True), nullable=True
+    )
+    created_by: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now()
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )
+
+    rules: Mapped[list["NotificationRule"]] = relationship(
+        "NotificationRule", back_populates="channel", lazy="select"
+    )
+    logs: Mapped[list["NotificationLog"]] = relationship(
+        "NotificationLog", back_populates="channel", lazy="select"
+    )
+
+
+class NotificationRule(Base):
+    """
+    Regola evento PEC -> canale di notifica.
+    Corrisponde alla tabella `notification_rules` nel DB.
+    """
+
+    __tablename__ = "notification_rules"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    tenant_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
+    channel_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("notification_channels.id", ondelete="CASCADE"),
+        nullable=False,
+    )
+    name: Mapped[str] = mapped_column(String(255), nullable=False)
+    event_type: Mapped[str] = mapped_column(String(100), nullable=False)
+    filter: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
+    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now()
+    )
+
+    channel: Mapped["NotificationChannel"] = relationship(
+        "NotificationChannel", back_populates="rules"
+    )
+
+
+class NotificationLog(Base):
+    """
+    Log di ogni tentativo di notifica con retry e circuit breaker.
+    Corrisponde alla tabella `notification_log` nel DB.
+    """
+
+    __tablename__ = "notification_log"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
+    )
+    tenant_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), nullable=False)
+    channel_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("notification_channels.id", ondelete="CASCADE"),
+        nullable=False,
+    )
+    rule_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("notification_rules.id", ondelete="SET NULL"),
+        nullable=True,
+    )
+    event_type: Mapped[str] = mapped_column(String(100), nullable=False)
+    event_payload: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
+    status: Mapped[str] = mapped_column(NotifStatus, nullable=False, default="pending")
+    attempt_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    max_attempts: Mapped[int] = mapped_column(Integer, nullable=False, default=3)
+    next_retry_at: Mapped[datetime | None] = mapped_column(
+        DateTime(timezone=True), nullable=True
+    )
+    last_error: Mapped[str | None] = mapped_column(Text, nullable=True)
+    http_status: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    sent_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now()
+    )
+
+    channel: Mapped["NotificationChannel"] = relationship(
+        "NotificationChannel", back_populates="logs"
+    )