extend complexity fields to text

backend/alembic.ini

@@ -2,7 +2,8 @@
 script_location = alembic
 prepend_sys_path = .
 version_path_separator = os
-sqlalchemy.url = postgresql+asyncpg://codetutor:codetutor@localhost:5432/codetutor
+# URL is set programmatically in alembic/env.py from environment variables
+sqlalchemy.url =
 
 [post_write_hooks]
 

backend/alembic/versions/001_initial_schema.py

@@ -19,9 +19,8 @@ depends_on: str | Sequence[str] | None = None
 
 
 def upgrade() -> None:
-    # Create difficulty enum
-    difficulty_enum = postgresql.ENUM("easy", "medium", "hard", name="difficulty_enum")
-    difficulty_enum.create(op.get_bind())
+    # Create difficulty enum using raw SQL to avoid SQLAlchemy auto-creation issues
+    op.execute("CREATE TYPE difficulty_enum AS ENUM ('easy', 'medium', 'hard')")
 
     # Create questions table
     op.create_table(
@@ -31,7 +30,7 @@ def upgrade() -> None:
         sa.Column("slug", sa.String(255), unique=True, nullable=False),
         sa.Column(
             "difficulty",
-            sa.Enum("easy", "medium", "hard", name="difficulty_enum"),
+            postgresql.ENUM("easy", "medium", "hard", name="difficulty_enum", create_type=False),
             nullable=False,
         ),
         sa.Column("description", sa.Text, nullable=False),
@@ -158,5 +157,4 @@ def downgrade() -> None:
     op.drop_table("explanations")
     op.drop_table("questions")
 
-    difficulty_enum = postgresql.ENUM("easy", "medium", "hard", name="difficulty_enum")
-    difficulty_enum.drop(op.get_bind())
+    op.execute("DROP TYPE IF EXISTS difficulty_enum")

backend/alembic/versions/11f3a598b82d_extend_complexity_fields_to_text.py

@@ -0,0 +1,52 @@
+"""extend complexity fields to text
+
+Revision ID: 11f3a598b82d
+Revises: 001
+Create Date: 2025-04-12 20:44:46.031680
+
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "11f3a598b82d"
+down_revision: str | None = "001"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.alter_column(
+        "explanations",
+        "time_complexity",
+        existing_type=sa.VARCHAR(length=50),
+        type_=sa.Text(),
+        existing_nullable=False,
+    )
+    op.alter_column(
+        "explanations",
+        "space_complexity",
+        existing_type=sa.VARCHAR(length=50),
+        type_=sa.Text(),
+        existing_nullable=False,
+    )
+
+
+def downgrade() -> None:
+    op.alter_column(
+        "explanations",
+        "space_complexity",
+        existing_type=sa.Text(),
+        type_=sa.VARCHAR(length=50),
+        existing_nullable=False,
+    )
+    op.alter_column(
+        "explanations",
+        "time_complexity",
+        existing_type=sa.Text(),
+        type_=sa.VARCHAR(length=50),
+        existing_nullable=False,
+    )