feat: Phase 4 - SQL AST analyzer, audit rules CRUD, Alembic, Docker (128 tests)

backend/app/models/audit_rule.py

@@ -0,0 +1,19 @@
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, func
+
+from app.core.database import Base
+
+
+class AuditRule(Base):
+    __tablename__ = "audit_rules"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    name = Column(String(100), nullable=False, unique=True)
+    description = Column(Text, nullable=True)
+    rule_type = Column(String(50), nullable=False)  # syntax / performance / safety / naming
+    severity = Column(String(20), default="warning")  # error / warning / info
+    db_type = Column(String(20), default="mysql")  # mysql / postgres / all
+    pattern = Column(Text, nullable=True)  # regex or keyword pattern
+    is_enabled = Column(Boolean, default=True)
+    message = Column(String(500), nullable=False)  # human-readable message
+    created_at = Column(DateTime, server_default=func.now())
+    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())