Fix some issues

migrations/env.py

@@ -0,0 +1,31 @@
+from logging.config import fileConfig
+from flask import current_app
+from alembic import context
+
+config = context.config
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = current_app.extensions['migrate'].db.metadata
+
+
+def run_migrations_offline():
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(url=url, target_metadata=target_metadata,
+                      literal_binds=True, dialect_opts={"paramstyle": "named"})
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    connectable = current_app.extensions['migrate'].db.engine
+    with connectable.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata)
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

migrations/versions/001_widen_ticket_history_values.py

@@ -0,0 +1,61 @@
+"""Widen ticket_history old_value / new_value from VARCHAR(200) to TEXT
+
+Revision ID: 001_widen_ticket_history_values
+Revises:
+Create Date: 2026-03-26
+
+Rationale
+---------
+TicketHistory.old_value and new_value were VARCHAR(200), which would cause
+a DataError (string too long) or silent truncation if a long internal_notes
+or resolution_notes value were ever stored in ticket history. TEXT has no
+practical upper-bound and is the correct type for free-form field snapshots.
+
+Apply
+-----
+    flask db upgrade
+
+Rollback
+--------
+    flask db downgrade
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = '001_widen_ticket_history_values'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    with op.batch_alter_table('ticket_history', schema=None) as batch_op:
+        batch_op.alter_column(
+            'old_value',
+            existing_type=sa.String(length=200),
+            type_=sa.Text(),
+            existing_nullable=True,
+        )
+        batch_op.alter_column(
+            'new_value',
+            existing_type=sa.String(length=200),
+            type_=sa.Text(),
+            existing_nullable=True,
+        )
+
+
+def downgrade():
+    with op.batch_alter_table('ticket_history', schema=None) as batch_op:
+        batch_op.alter_column(
+            'new_value',
+            existing_type=sa.Text(),
+            type_=sa.String(length=200),
+            existing_nullable=True,
+        )
+        batch_op.alter_column(
+            'old_value',
+            existing_type=sa.Text(),
+            type_=sa.String(length=200),
+            existing_nullable=True,
+        )