Add unique constraint for session id

services/ingest-service/alembic/script.py.mako

@@ -0,0 +1,27 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, Sequence[str], None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
+

services/ingest-service/alembic/versions/9163176d6848_add_unique_constraint_to_call_session_id.py

@@ -0,0 +1,33 @@
+"""add_unique_constraint_to_call_session_id
+
+Revision ID: 9163176d6848
+Revises: a7e5c5ef6bc1
+Create Date: 2025-11-20 23:28:40.770696
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '9163176d6848'
+down_revision: Union[str, Sequence[str], None] = 'a7e5c5ef6bc1'
+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_index(op.f('ix_call_events_call_session_id'), table_name='call_events')
+    op.create_index(op.f('ix_call_events_call_session_id'), 'call_events', ['call_session_id'], unique=True)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_call_events_call_session_id'), table_name='call_events')
+    op.create_index(op.f('ix_call_events_call_session_id'), 'call_events', ['call_session_id'], unique=False)
+    # ### end Alembic commands ###
+

services/ingest-service/app/models/call_event.py

@@ -7,7 +7,7 @@ class CallEvent(Base):
     __tablename__ = "call_events"
 
     id = Column(PG_UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, index=True)
-    call_session_id = Column(BigInteger, nullable=False, index=True)
+    call_session_id = Column(BigInteger, nullable=False, unique=True, index=True)
     direction = Column(String, nullable=False)
     notification_mnemonic = Column(String, nullable=False)
     last_answered_employee_full_name = Column(String, nullable=True)