feat(phase-31): add campaign scheduling and recurring automation (T-233 to T-234)

backend/app/models/campaign.py

@@ -8,7 +8,7 @@ import uuid
 from datetime import datetime
 
 from sqlalchemy import (
-    Column, String, Text, Integer, DateTime,
+    Column, String, Text, Integer, Boolean, DateTime,
     ForeignKey, Index,
 )
 from sqlalchemy.dialects.postgresql import UUID, JSONB
@@ -56,6 +56,17 @@ class Campaign(Base):
     tags = Column(JSONB, nullable=True, default=[])
     created_at = Column(DateTime, default=datetime.utcnow)
 
+    # Recurring scheduling fields
+    is_recurring = Column(Boolean, default=False)
+    recurrence_pattern = Column(String, nullable=True)   # weekly, monthly, quarterly
+    next_run_at = Column(DateTime, nullable=True)
+    last_run_at = Column(DateTime, nullable=True)
+    parent_campaign_id = Column(
+        UUID(as_uuid=True),
+        ForeignKey("campaigns.id", ondelete="SET NULL"),
+        nullable=True,
+    )
+
     # Relationships
     threat_actor = relationship("ThreatActor")
     creator = relationship("User", foreign_keys=[created_by])
@@ -65,12 +76,23 @@ class Campaign(Base):
         cascade="all, delete-orphan",
         order_by="CampaignTest.order_index",
     )
+    parent_campaign = relationship(
+        "Campaign",
+        remote_side="Campaign.id",
+        foreign_keys=[parent_campaign_id],
+    )
+    child_campaigns = relationship(
+        "Campaign",
+        foreign_keys=[parent_campaign_id],
+        back_populates="parent_campaign",
+    )
 
     __table_args__ = (
         Index('ix_campaigns_status', 'status'),
         Index('ix_campaigns_type', 'type'),
         Index('ix_campaigns_threat_actor', 'threat_actor_id'),
         Index('ix_campaigns_created_by', 'created_by'),
+        Index('ix_campaigns_next_run', 'next_run_at'),
     )