fix: update VARCHAR lengths to prevent truncation errors in audit_log and discharges

backend/alembic/versions/i7j8k9l0m1n2_fix_varchar20_truncation_errors.py

@@ -0,0 +1,104 @@
+"""Fix VARCHAR(20) truncation errors in audit_log and discharges
+
+Revision ID: i7j8k9l0m1n2
+Revises: h1a2b3c4d5e6
+Create Date: 2026-04-30 13:00:00.000000
+
+Issues fixed:
+- audit_log.system: String(20) → String(50)
+- audit_log.operation_type: String(20) → String(50)  
+- discharges.cancelled_by: String(20) → String(100)
+- octave_balance.octave_permit: String(20) → String(100)
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = 'i7j8k9l0m1n2'
+down_revision = 'h1a2b3c4d5e6'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Fix audit_log.system
+    op.alter_column(
+        'audit_logs',
+        'system',
+        existing_type=sa.String(length=20),
+        type_=sa.String(length=50),
+        existing_nullable=False,
+        schema='a76',
+    )
+    
+    # Fix audit_log.operation_type
+    op.alter_column(
+        'audit_logs',
+        'operation_type',
+        existing_type=sa.String(length=20),
+        type_=sa.String(length=50),
+        existing_nullable=True,
+        schema='a76',
+    )
+    
+    # Fix discharges.cancelled_by
+    op.alter_column(
+        'discharge_header',
+        'cancelled_by',
+        existing_type=sa.String(length=20),
+        type_=sa.String(length=100),
+        existing_nullable=True,
+        schema='a24',
+    )
+    
+    # Fix octave_balance.octave_permit
+    op.alter_column(
+        'octave_balance',
+        'octave_permit',
+        existing_type=sa.String(length=20),
+        type_=sa.String(length=100),
+        existing_nullable=False,
+        schema='a76',
+    )
+
+
+def downgrade() -> None:
+    # Revert octave_balance.octave_permit
+    op.alter_column(
+        'octave_balance',
+        'octave_permit',
+        existing_type=sa.String(length=100),
+        type_=sa.String(length=20),
+        existing_nullable=False,
+        schema='a76',
+    )
+    
+    # Revert discharges.cancelled_by
+    op.alter_column(
+        'discharge_header',
+        'cancelled_by',
+        existing_type=sa.String(length=100),
+        type_=sa.String(length=20),
+        existing_nullable=True,
+        schema='a24',
+    )
+    
+    # Revert audit_log.operation_type
+    op.alter_column(
+        'audit_logs',
+        'operation_type',
+        existing_type=sa.String(length=50),
+        type_=sa.String(length=20),
+        existing_nullable=True,
+        schema='a76',
+    )
+    
+    # Revert audit_log.system
+    op.alter_column(
+        'audit_logs',
+        'system',
+        existing_type=sa.String(length=50),
+        type_=sa.String(length=20),
+        existing_nullable=False,
+        schema='a76',
+    )