diff --git a/backend/alembic/versions/ee73fc803704_cascade_commit.py b/backend/alembic/versions/ee73fc803704_cascade_commit.py
new file mode 100644
index 00000000..9137c2ea
--- /dev/null
+++ b/backend/alembic/versions/ee73fc803704_cascade_commit.py
@@ -0,0 +1,44 @@
+"""cascade commit
+
+Revision ID: ee73fc803704
+Revises: 663b3fea3024
+Create Date: 2023-12-03 18:44:07.577117
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = 'ee73fc803704'
+down_revision: Union[str, None] = '663b3fea3024'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint('conversationdocument_document_id_fkey', 'conversationdocument', type_='foreignkey')
+    op.drop_constraint('conversationdocument_conversation_id_fkey', 'conversationdocument', type_='foreignkey')
+    op.create_foreign_key(None, 'conversationdocument', 'document', ['document_id'], ['id'], ondelete='CASCADE')
+    op.create_foreign_key(None, 'conversationdocument', 'conversation', ['conversation_id'], ['id'], ondelete='CASCADE')
+    op.drop_constraint('message_conversation_id_fkey', 'message', type_='foreignkey')
+    op.create_foreign_key(None, 'message', 'conversation', ['conversation_id'], ['id'], ondelete='CASCADE')
+    op.drop_constraint('messagesubprocess_message_id_fkey', 'messagesubprocess', type_='foreignkey')
+    op.create_foreign_key(None, 'messagesubprocess', 'message', ['message_id'], ['id'], ondelete='CASCADE')
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, 'messagesubprocess', type_='foreignkey')
+    op.create_foreign_key('messagesubprocess_message_id_fkey', 'messagesubprocess', 'message', ['message_id'], ['id'])
+    op.drop_constraint(None, 'message', type_='foreignkey')
+    op.create_foreign_key('message_conversation_id_fkey', 'message', 'conversation', ['conversation_id'], ['id'])
+    op.drop_constraint(None, 'conversationdocument', type_='foreignkey')
+    op.drop_constraint(None, 'conversationdocument', type_='foreignkey')
+    op.create_foreign_key('conversationdocument_conversation_id_fkey', 'conversationdocument', 'conversation', ['conversation_id'], ['id'])
+    op.create_foreign_key('conversationdocument_document_id_fkey', 'conversationdocument', 'document', ['document_id'], ['id'])
+    # ### end Alembic commands ###
diff --git a/backend/app/models/db.py b/backend/app/models/db.py
index 36923876..4934d7ff 100644
--- a/backend/app/models/db.py
+++ b/backend/app/models/db.py
@@ -46,7 +46,7 @@ class Document(Base):
     # URL to the actual document (e.g. a PDF)
     url = Column(String, nullable=False, unique=True)
     metadata_map = Column(JSONB, nullable=True)
-    conversations = relationship("ConversationDocument", back_populates="document")
+    conversations = relationship("ConversationDocument", back_populates="document", cascade="all, delete", passive_deletes=True)
 
 
 class Conversation(Base):
@@ -54,9 +54,9 @@ class Conversation(Base):
     A conversation with messages and linked documents
     """
 
-    messages = relationship("Message", back_populates="conversation")
+    messages = relationship("Message", back_populates="conversation", cascade="all, delete", passive_deletes=True,)
     conversation_documents = relationship(
-        "ConversationDocument", back_populates="conversation"
+        "ConversationDocument", back_populates="conversation", cascade="all, delete", passive_deletes=True,
     )
 
 
@@ -66,9 +66,9 @@ class ConversationDocument(Base):
     """
 
     conversation_id = Column(
-        UUID(as_uuid=True), ForeignKey("conversation.id"), index=True
+        UUID(as_uuid=True), ForeignKey("conversation.id", ondelete="CASCADE"), index=True
     )
-    document_id = Column(UUID(as_uuid=True), ForeignKey("document.id"), index=True)
+    document_id = Column(UUID(as_uuid=True), ForeignKey("document.id", ondelete="CASCADE"), index=True)
     conversation = relationship("Conversation", back_populates="conversation_documents")
     document = relationship("Document", back_populates="conversations")
 
@@ -79,13 +79,13 @@ class Message(Base):
     """
 
     conversation_id = Column(
-        UUID(as_uuid=True), ForeignKey("conversation.id"), index=True
+        UUID(as_uuid=True), ForeignKey("conversation.id", ondelete="CASCADE"), index=True
     )
     content = Column(String)
     role = Column(to_pg_enum(MessageRoleEnum))
     status = Column(to_pg_enum(MessageStatusEnum), default=MessageStatusEnum.PENDING)
     conversation = relationship("Conversation", back_populates="messages")
-    sub_processes = relationship("MessageSubProcess", back_populates="message")
+    sub_processes = relationship("MessageSubProcess", back_populates="message", cascade="all, delete", passive_deletes=True)
 
 
 class MessageSubProcess(Base):
@@ -93,7 +93,7 @@ class MessageSubProcess(Base):
     A record of a sub-process that occurred as part of the generation of a message from an AI assistant
     """
 
-    message_id = Column(UUID(as_uuid=True), ForeignKey("message.id"), index=True)
+    message_id = Column(UUID(as_uuid=True), ForeignKey("message.id", ondelete="CASCADE"), index=True)
     source = Column(to_pg_enum(MessageSubProcessSourceEnum))
     message = relationship("Message", back_populates="sub_processes")
     status = Column(
@@ -101,4 +101,4 @@ class MessageSubProcess(Base):
         default=MessageSubProcessStatusEnum.FINISHED,
         nullable=False,
     )
-    metadata_map = Column(JSONB, nullable=True)
+    metadata_map = Column(JSONB, nullable=True)
\ No newline at end of file