Implement Phase 4: ML threat detection, automated playbooks, and advanced reporting

Co-authored-by: mblanke <9078342+mblanke@users.noreply.github.com>

backend/app/models/report_template.py

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+from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Boolean, Text, JSON
+from sqlalchemy.orm import relationship
+from datetime import datetime, timezone
+
+from app.core.database import Base
+
+
+class ReportTemplate(Base):
+    __tablename__ = "report_templates"
+
+    id = Column(Integer, primary_key=True, index=True)
+    tenant_id = Column(Integer, ForeignKey("tenants.id"), nullable=False)
+    name = Column(String, nullable=False, index=True)
+    description = Column(Text, nullable=True)
+    template_type = Column(String, nullable=False)  # case_summary, host_analysis, threat_report
+    template_config = Column(JSON, nullable=False)  # Configuration for report generation
+    is_default = Column(Boolean, default=False, nullable=False)
+    created_by = Column(Integer, ForeignKey("users.id"), nullable=False)
+    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+
+    # Relationships
+    tenant = relationship("Tenant")
+    creator = relationship("User")
+
+
+class Report(Base):
+    __tablename__ = "reports"
+
+    id = Column(Integer, primary_key=True, index=True)
+    tenant_id = Column(Integer, ForeignKey("tenants.id"), nullable=False)
+    template_id = Column(Integer, ForeignKey("report_templates.id"), nullable=True)
+    title = Column(String, nullable=False)
+    report_type = Column(String, nullable=False)
+    format = Column(String, nullable=False)  # pdf, html, json
+    file_path = Column(String, nullable=True)
+    status = Column(String, nullable=False)  # generating, completed, failed
+    generated_by = Column(Integer, ForeignKey("users.id"), nullable=False)
+    generated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
+
+    # Relationships
+    tenant = relationship("Tenant")
+    template = relationship("ReportTemplate")
+    generator = relationship("User")