feat(backend): add Alembic migrations

2025-04-15 22:47:23 +01:00
parent eca1503be5
commit 3ed51bce74
4 changed files with 298 additions and 0 deletions
--- a/backend/alembic/versions/001_initial_schema.py
+++ b/backend/alembic/versions/001_initial_schema.py
@@ -0,0 +1,162 @@
+"""Initial schema
+
+Revision ID: 001
+Revises:
+Create Date: 2025-01-30
+
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+revision: str = "001"
+down_revision: str | None = None
+branch_labels: str | Sequence[str] | None = None
+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 questions table
+    op.create_table(
+        "questions",
+        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True),
+        sa.Column("title", sa.String(255), nullable=False),
+        sa.Column("slug", sa.String(255), unique=True, nullable=False),
+        sa.Column(
+            "difficulty",
+            sa.Enum("easy", "medium", "hard", name="difficulty_enum"),
+            nullable=False,
+        ),
+        sa.Column("description", sa.Text, nullable=False),
+        sa.Column("constraints", sa.Text, nullable=True),
+        sa.Column("examples", postgresql.JSONB, nullable=True),
+        sa.Column("leetcode_id", sa.Integer, unique=True, nullable=True),
+        sa.Column("leetcode_url", sa.String(512), nullable=True),
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            server_default=sa.func.now(),
+            nullable=False,
+        ),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(timezone=True),
+            server_default=sa.func.now(),
+            nullable=False,
+        ),
+    )
+    op.create_index("ix_questions_slug", "questions", ["slug"])
+    op.create_index("ix_questions_difficulty", "questions", ["difficulty"])
+
+    # Create explanations table
+    op.create_table(
+        "explanations",
+        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True),
+        sa.Column(
+            "question_id",
+            postgresql.UUID(as_uuid=True),
+            sa.ForeignKey("questions.id", ondelete="CASCADE"),
+            unique=True,
+            nullable=False,
+        ),
+        sa.Column("approach", sa.Text, nullable=False),
+        sa.Column("intuition", sa.Text, nullable=False),
+        sa.Column("common_pitfalls", postgresql.JSONB, nullable=True),
+        sa.Column("key_takeaways", postgresql.JSONB, nullable=True),
+        sa.Column("time_complexity", sa.String(50), nullable=False),
+        sa.Column("space_complexity", sa.String(50), nullable=False),
+        sa.Column("complexity_explanation", sa.Text, nullable=True),
+    )
+
+    # Create solutions table
+    op.create_table(
+        "solutions",
+        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True),
+        sa.Column(
+            "question_id",
+            postgresql.UUID(as_uuid=True),
+            sa.ForeignKey("questions.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column("approach_name", sa.String(100), nullable=False),
+        sa.Column("code", sa.Text, nullable=False),
+        sa.Column("language", sa.String(20), server_default="python", nullable=False),
+        sa.Column("is_optimal", sa.Boolean, server_default="false", nullable=False),
+        sa.Column("explanation", sa.Text, nullable=True),
+    )
+    op.create_index("ix_solutions_question_id", "solutions", ["question_id"])
+
+    # Create categories table
+    op.create_table(
+        "categories",
+        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True),
+        sa.Column("name", sa.String(100), unique=True, nullable=False),
+        sa.Column("slug", sa.String(100), unique=True, nullable=False),
+        sa.Column("description", sa.Text, nullable=True),
+    )
+    op.create_index("ix_categories_slug", "categories", ["slug"])
+
+    # Create patterns table
+    op.create_table(
+        "patterns",
+        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True),
+        sa.Column("name", sa.String(100), unique=True, nullable=False),
+        sa.Column("slug", sa.String(100), unique=True, nullable=False),
+        sa.Column("description", sa.Text, nullable=True),
+        sa.Column("when_to_use", sa.Text, nullable=True),
+    )
+    op.create_index("ix_patterns_slug", "patterns", ["slug"])
+
+    # Create question_categories junction table
+    op.create_table(
+        "question_categories",
+        sa.Column(
+            "question_id",
+            postgresql.UUID(as_uuid=True),
+            sa.ForeignKey("questions.id", ondelete="CASCADE"),
+            primary_key=True,
+        ),
+        sa.Column(
+            "category_id",
+            postgresql.UUID(as_uuid=True),
+            sa.ForeignKey("categories.id", ondelete="CASCADE"),
+            primary_key=True,
+        ),
+    )
+
+    # Create question_patterns junction table
+    op.create_table(
+        "question_patterns",
+        sa.Column(
+            "question_id",
+            postgresql.UUID(as_uuid=True),
+            sa.ForeignKey("questions.id", ondelete="CASCADE"),
+            primary_key=True,
+        ),
+        sa.Column(
+            "pattern_id",
+            postgresql.UUID(as_uuid=True),
+            sa.ForeignKey("patterns.id", ondelete="CASCADE"),
+            primary_key=True,
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("question_patterns")
+    op.drop_table("question_categories")
+    op.drop_table("patterns")
+    op.drop_table("categories")
+    op.drop_table("solutions")
+    op.drop_table("explanations")
+    op.drop_table("questions")
+
+    difficulty_enum = postgresql.ENUM("easy", "medium", "hard", name="difficulty_enum")
+    difficulty_enum.drop(op.get_bind())