feat(phase-21): add V3 demo seed, DataSource and DetectionRule models (T-200, T-201, T-202)

backend/app/models/data_source.py

@@ -0,0 +1,39 @@
+"""DataSource model — registry of external data sources for import."""
+
+import uuid
+from datetime import datetime
+
+from sqlalchemy import Column, String, Text, Boolean, DateTime, Index
+from sqlalchemy.dialects.postgresql import UUID, JSONB
+
+from app.database import Base
+
+
+class DataSource(Base):
+    """
+    Unified registry of all external data sources (attack procedures,
+    detection rules, threat intel, defensive techniques).
+
+    Each source can be independently enabled/disabled and tracks its own
+    synchronisation state.
+    """
+    __tablename__ = "data_sources"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    name = Column(String, unique=True, nullable=False)            # e.g. "atomic_red_team"
+    display_name = Column(String, nullable=False)                  # e.g. "Atomic Red Team"
+    type = Column(String, nullable=False)                          # attack_procedure / detection_rule / threat_intel / defensive_technique
+    url = Column(String, nullable=True)                            # URL base of repo/API
+    description = Column(Text, nullable=True)
+    is_enabled = Column(Boolean, default=True)
+    last_sync_at = Column(DateTime, nullable=True)
+    last_sync_status = Column(String, nullable=True)               # success / error / in_progress
+    last_sync_stats = Column(JSONB, nullable=True)                 # {"imported": X, "updated": Y, ...}
+    sync_frequency = Column(String, nullable=True)                 # daily / weekly / monthly / manual
+    config = Column(JSONB, nullable=True)                          # source-specific configuration
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+    __table_args__ = (
+        Index('ix_data_sources_type', 'type'),
+        Index('ix_data_sources_is_enabled', 'is_enabled'),
+    )