diff --git a/app/models.py b/app/models.py
new file mode 100644
index 0000000..3d20425
--- /dev/null
+++ b/app/models.py
@@ -0,0 +1,68 @@
+from sqlalchemy import Column, String, Boolean, Text, DateTime, Integer
+from datetime import datetime
+from db import Base
+
+class User(Base):
+    __tablename__ = "users"
+    id = Column(String, primary_key=True)
+    email = Column(String, unique=True)
+    name = Column(String)
+    twofa_enabled = Column(Boolean, default=False)
+    twofa_method = Column(String, default="totp")
+    twofa_secret = Column(String)
+    twofa_sensitive_actions = Column(Boolean, default=False)
+
+class Preferences(Base):
+    __tablename__ = "preferences"
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_id = Column(String)
+    preferred_mode = Column(String, default="conversar")
+    auto_search = Column(Boolean, default=True)
+    auto_monitoring = Column(Boolean, default=False)
+    preferred_export = Column(String, default="pdfa")
+    likes_suggestions = Column(Boolean, default=True)
+    likes_quick_actions = Column(Boolean, default=True)
+
+class Conversation(Base):
+    __tablename__ = "conversations"
+    id = Column(String, primary_key=True)
+    user_id = Column(String)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    mode = Column(String)
+    context_summary = Column(Text)
+
+class Message(Base):
+    __tablename__ = "messages"
+    id = Column(String, primary_key=True)
+    conversation_id = Column(String)
+    role = Column(String)
+    content = Column(Text)
+    metadata = Column(Text)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+class MonitoringTopic(Base):
+    __tablename__ = "monitoring_topics"
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_id = Column(String)
+    label = Column(String)
+    sources = Column(Text)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    active = Column(Boolean, default=True)
+
+class Alert(Base):
+    __tablename__ = "alerts"
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_id = Column(String)
+    monitoring_topic_id = Column(Integer)
+    title = Column(String)
+    description = Column(Text)
+    source = Column(String)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+class AuditTrail(Base):
+    __tablename__ = "audit_trail"
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_email = Column(String)
+    action = Column(String)
+    details = Column(Text)
+    timestamp = Column(DateTime, default=datetime.utcnow)