Fix: Refactor(migrations), replace obsolete migration for categories_added and category_error columns (#143)

- Removed the previous migration script that added 'categories_added'
and 'category_error' columns to the submissions table.
- Introduced a new migration script that includes these columns along
with additional changes to the contests table, enhancing the overall
structure and functionality.

Fixes #109

Author: Aditya0545

backend/alembic/versions/8ecb36347b53_add_categories_added_and_category_error_.py

@@ -0,0 +1,73 @@
+"""Add categories_added and category_error columns to submissions table
+
+Revision ID: ed3dabd7833f
+Revises: c4d1d7879989
+Create Date: 2026-01-14 16:17:46.783789
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision = 'ed3dabd7833f'
+down_revision = 'c4d1d7879989'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('contests', sa.Column('template_link', sa.Text(), nullable=True))
+    op.alter_column('contests', 'scoring_parameters',
+               existing_type=mysql.TEXT(),
+               comment=None,
+               existing_comment='Weights for scoring parameters',
+               existing_nullable=True)
+    op.alter_column('contests', 'min_reference_count',
+               existing_type=mysql.INTEGER(),
+               server_default=None,
+               comment=None,
+               existing_comment='Minimum number of references required for article submissions',
+               existing_nullable=False)
+    op.alter_column('contests', 'organizers',
+               existing_type=mysql.TEXT(),
+               comment=None,
+               existing_comment='Comma-separated list of organizer usernames',
+               existing_nullable=True)
+    op.add_column('submissions', sa.Column('template_added', sa.Boolean(), nullable=True))
+    op.add_column('submissions', sa.Column('categories_added', sa.Text(), nullable=True))
+    op.add_column('submissions', sa.Column('category_error', sa.Text(), nullable=True))
+    op.alter_column('submissions', 'parameter_scores',
+               existing_type=mysql.TEXT(),
+               comment=None,
+               existing_comment='Per-parameter jury scores and comments',
+               existing_nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('submissions', 'parameter_scores',
+               existing_type=mysql.TEXT(),
+               comment='Per-parameter jury scores and comments',
+               existing_nullable=True)
+    op.drop_column('submissions', 'category_error')
+    op.drop_column('submissions', 'categories_added')
+    op.drop_column('submissions', 'template_added')
+    op.alter_column('contests', 'organizers',
+               existing_type=mysql.TEXT(),
+               comment='Comma-separated list of organizer usernames',
+               existing_nullable=True)
+    op.alter_column('contests', 'min_reference_count',
+               existing_type=mysql.INTEGER(),
+               server_default=sa.text("'0'"),
+               comment='Minimum number of references required for article submissions',
+               existing_nullable=False)
+    op.alter_column('contests', 'scoring_parameters',
+               existing_type=mysql.TEXT(),
+               comment='Weights for scoring parameters',
+               existing_nullable=True)
+    op.drop_column('contests', 'template_link')
+    # ### end Alembic commands ###
+