Revert: Remove personal modifications in api/migrations/versions/ directory

- Delete custom migration file 75f1de22b8f3_merge_multiple_heads_for_database_.py
- Restore deleted migration file 47cc7df8c4f3_modify_default_model_name_length.py
- Reset migrations directory to match upstream main branch

api/migrations/versions/2025_06_11_1254-75f1de22b8f3_merge_multiple_heads_for_database_.py

@@ -1,31 +0,0 @@
-"""Merge multiple heads for database migration
-
-Revision ID: 75f1de22b8f3
-Revises: 83f1262d3f22, 4474872b0ee6
-Create Date: 2025-06-11 12:54:20.128554
-
-"""
-from alembic import op
-import models as models
-import sqlalchemy as sa
-
-
-# revision identifiers, used by Alembic.
-revision = '75f1de22b8f3'
-down_revision = '4474872b0ee6'
-branch_labels = None
-depends_on = None
-
-
-def upgrade():
-    # ### commands auto generated by Alembic - please adjust! ###
-    with op.batch_alter_table('messages', schema=None) as batch_op:
-        batch_op.add_column(sa.Column('outputs', sa.Text(), server_default=sa.text("'{}'::text"), nullable=True))
-    # ### end Alembic commands ###
-
-
-def downgrade():
-    # ### commands auto generated by Alembic - please adjust! ###
-    with op.batch_alter_table('messages', schema=None) as batch_op:
-        batch_op.drop_column('outputs')
-    # ### end Alembic commands ###

api/migrations/versions/47cc7df8c4f3_modify_default_model_name_length.py

@@ -0,0 +1,39 @@
+"""modify default model name length
+
+Revision ID: 47cc7df8c4f3
+Revises: 3c7cac9521c6
+Create Date: 2024-05-10 09:48:09.046298
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+import models as models
+
+# revision identifiers, used by Alembic.
+revision = '47cc7df8c4f3'
+down_revision = '3c7cac9521c6'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('tenant_default_models', schema=None) as batch_op:
+        batch_op.alter_column('model_name',
+                              existing_type=sa.VARCHAR(length=40),
+                              type_=sa.String(length=255),
+                              existing_nullable=False)
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('tenant_default_models', schema=None) as batch_op:
+        batch_op.alter_column('model_name',
+                              existing_type=sa.String(length=255),
+                              type_=sa.VARCHAR(length=40),
+                              existing_nullable=False)
+
+    # ### end Alembic commands ###