06/09 Update a customer AI chatbot and support form submision

migrations/versions/phase23_support_tickets.py

@@ -0,0 +1,70 @@
+"""phase23 — support tickets
+
+Creates two tables:
+  support_tickets        — customer-submitted help requests
+  support_ticket_replies — admin/staff replies to those tickets
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision      = 'phase23_support_tickets'
+down_revision = 'phase22_comment_visibility'
+branch_labels = None
+depends_on    = None
+
+
+def _table_exists(bind, table: str) -> bool:
+    result = bind.execute(sa.text(
+        "SELECT COUNT(*) FROM information_schema.tables "
+        "WHERE table_schema = DATABASE() AND table_name = :t"
+    ), {'t': table})
+    return result.scalar() > 0
+
+
+def upgrade():
+    bind = op.get_bind()
+
+    if not _table_exists(bind, 'support_tickets'):
+        op.execute(sa.text("""
+            CREATE TABLE support_tickets (
+                id          INT          NOT NULL AUTO_INCREMENT PRIMARY KEY,
+                customer_id INT          NULL,
+                facility_id INT          NULL,
+                subject     VARCHAR(200) NOT NULL,
+                body        TEXT         NOT NULL,
+                status      VARCHAR(20)  NOT NULL DEFAULT 'open',
+                created_at  DATETIME     NOT NULL,
+                CONSTRAINT fk_st_customer FOREIGN KEY (customer_id)
+                    REFERENCES users(id) ON DELETE SET NULL,
+                CONSTRAINT fk_st_facility FOREIGN KEY (facility_id)
+                    REFERENCES facilities(id) ON DELETE SET NULL,
+                INDEX ix_support_tickets_customer (customer_id),
+                INDEX ix_support_tickets_status  (status),
+                INDEX ix_support_tickets_created (created_at)
+            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
+        """))
+
+    if not _table_exists(bind, 'support_ticket_replies'):
+        op.execute(sa.text("""
+            CREATE TABLE support_ticket_replies (
+                id         INT      NOT NULL AUTO_INCREMENT PRIMARY KEY,
+                ticket_id  INT      NOT NULL,
+                user_id    INT      NULL,
+                body       TEXT     NOT NULL,
+                created_at DATETIME NOT NULL,
+                CONSTRAINT fk_str_ticket FOREIGN KEY (ticket_id)
+                    REFERENCES support_tickets(id) ON DELETE CASCADE,
+                CONSTRAINT fk_str_user FOREIGN KEY (user_id)
+                    REFERENCES users(id) ON DELETE SET NULL,
+                INDEX ix_support_replies_ticket (ticket_id)
+            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
+        """))
+
+
+def downgrade():
+    bind = op.get_bind()
+    if _table_exists(bind, 'support_ticket_replies'):
+        op.execute(sa.text('DROP TABLE support_ticket_replies'))
+    if _table_exists(bind, 'support_tickets'):
+        op.execute(sa.text('DROP TABLE support_tickets'))