Jul 9 - Chat - save chat sessions

2026-07-09 13:40:56 -04:00
parent 71aef4fe8e
commit 5cf85c564b
12 changed files with 471 additions and 50 deletions
@@ -0,0 +1,58 @@
+"""phase37 — persist AI support-chat conversations
+
+Creates support_chat_sessions + support_chat_messages so customer AI-chat
+conversations are saved for later reference and continuity.
+
+Uses table existence checks — safe to re-run.
+"""
+
+revision      = 'phase37_support_chat'
+down_revision = 'phase36_scheduled_insp'
+branch_labels = None
+depends_on    = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def _table_exists(conn, table):
+    return conn.execute(sa.text(
+        "SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES "
+        "WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = :t"
+    ), {"t": table}).scalar() > 0
+
+
+def upgrade():
+    bind = op.get_bind()
+
+    if not _table_exists(bind, 'support_chat_sessions'):
+        op.create_table(
+            'support_chat_sessions',
+            sa.Column('id', sa.Integer, primary_key=True),
+            sa.Column('customer_id', sa.Integer,
+                      sa.ForeignKey('users.id', ondelete='CASCADE'), nullable=False),
+            sa.Column('created_at', sa.DateTime, nullable=False),
+            sa.Column('updated_at', sa.DateTime, nullable=False),
+        )
+        op.create_index('ix_scs_customer', 'support_chat_sessions', ['customer_id'])
+        op.create_index('ix_scs_updated', 'support_chat_sessions', ['updated_at'])
+
+    if not _table_exists(bind, 'support_chat_messages'):
+        op.create_table(
+            'support_chat_messages',
+            sa.Column('id', sa.Integer, primary_key=True),
+            sa.Column('session_id', sa.Integer,
+                      sa.ForeignKey('support_chat_sessions.id', ondelete='CASCADE'), nullable=False),
+            sa.Column('role', sa.String(16), nullable=False),
+            sa.Column('content', sa.Text, nullable=False),
+            sa.Column('created_at', sa.DateTime, nullable=False),
+        )
+        op.create_index('ix_scm_session', 'support_chat_messages', ['session_id'])
+
+
+def downgrade():
+    bind = op.get_bind()
+    if _table_exists(bind, 'support_chat_messages'):
+        op.drop_table('support_chat_messages')
+    if _table_exists(bind, 'support_chat_sessions'):
+        op.drop_table('support_chat_sessions')