Increase maximum comment size from 255 to 1024.

DB change: Change comment text field from VARCHAR(255) to mysql.TEXT

migrations/versions/b79d2fcafd88_comment_text.py

@@ -0,0 +1,33 @@
+"""Change comment text field from VARCHAR(255) to mysql.TEXT
+
+Revision ID: b79d2fcafd88
+Revises: ffd23e570f92
+Create Date: 2017-08-14 18:57:44.165168
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision = 'b79d2fcafd88'
+down_revision = 'ffd23e570f92'
+branch_labels = None
+depends_on = None
+
+TABLE_PREFIXES = ('nyaa', 'sukebei')
+
+def upgrade():
+    for prefix in TABLE_PREFIXES:
+        op.alter_column(prefix + '_comments', 'text',
+                   existing_type=mysql.VARCHAR(charset='utf8mb4', collation='utf8mb4_bin', length=255),
+                   type_=mysql.TEXT(collation='utf8mb4_bin'),
+                   existing_nullable=False)
+
+
+def downgrade():
+    for prefix in TABLE_PREFIXES:
+        op.alter_column(prefix + '_comments', 'text',
+                   existing_type=mysql.TEXT(collation='utf8mb4_bin'),
+                   type_=mysql.VARCHAR(charset='utf8mb4', collation='utf8mb4_bin', length=255),
+                   existing_nullable=False)