Add correlated calendar invitation capability

src/govoplan_calendar/backend/db/models.py

@@ -52,6 +52,11 @@ class CalendarEvent(Base, TimestampMixin):
         UniqueConstraint("calendar_id", "uid", "recurrence_id", name="uq_calendar_events_calendar_uid_recurrence"),
         Index("ix_calendar_events_range", "tenant_id", "calendar_id", "start_at", "end_at"),
         Index("ix_calendar_events_tenant_uid", "tenant_id", "uid"),
+        Index(
+            "ix_calendar_events_tenant_correlation",
+            "tenant_id",
+            "correlation_key",
+        ),
         Index("ix_calendar_events_tenant_status", "tenant_id", "status"),
     )
 
@@ -59,6 +64,18 @@ class CalendarEvent(Base, TimestampMixin):
     tenant_id: Mapped[str] = mapped_column(String(36), nullable=False, index=True)
     calendar_id: Mapped[str] = mapped_column(ForeignKey("calendar_collections.id", ondelete="CASCADE"), nullable=False, index=True)
     uid: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
+    correlation_key: Mapped[str | None] = mapped_column(
+        String(255), nullable=True, index=True
+    )
+    producer_module: Mapped[str | None] = mapped_column(
+        String(100), nullable=True, index=True
+    )
+    producer_resource_type: Mapped[str | None] = mapped_column(
+        String(100), nullable=True
+    )
+    producer_resource_id: Mapped[str | None] = mapped_column(
+        String(255), nullable=True, index=True
+    )
     recurrence_id: Mapped[str | None] = mapped_column(String(255), nullable=True, index=True)
     sequence: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
     summary: Mapped[str] = mapped_column(String(500), nullable=False)