WIP checkpoint: US-1: Asset Import Pipeline — glTF upload endpoint with metadata extraction

backend/alembic/env.py

@@ -8,7 +8,7 @@ from sqlalchemy.ext.asyncio import create_async_engine
 
 from app.config import settings
 from app.database import Base
-from app.models import user, session, world, asset, world_visit  # noqa: F401
+from app.models import user, session, world, asset  # noqa: F401
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.

backend/alembic/versions/0003_add_discovery_metadata.py

@@ -1,104 +0,0 @@
-"""add discovery metadata to worlds and create world_visits
-
-Revision ID: 0003_add_discovery_metadata
-Revises: 0002_add_date_of_birth_to_users
-Create Date: 2025-01-02 00:00:00.000000
-
-"""
-from typing import Sequence, Union
-
-from alembic import op
-import sqlalchemy as sa
-from sqlalchemy.dialects import postgresql
-
-# revision identifiers, used by Alembic.
-revision: str = "0003_add_discovery_metadata"
-down_revision: Union[str, None] = "0002_add_date_of_birth_to_users"
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
-
-
-def upgrade() -> None:
-    """Add discovery metadata columns to worlds and create world_visits."""
-    # Add discovery metadata columns to worlds.
-    op.add_column(
-        "worlds",
-        sa.Column("category", sa.String(length=100), nullable=True),
-    )
-    op.add_column(
-        "worlds",
-        sa.Column(
-            "tags",
-            postgresql.ARRAY(sa.String()),
-            nullable=True,
-            server_default="{}",
-        ),
-    )
-    op.add_column(
-        "worlds",
-        sa.Column("play_count", sa.Integer(), nullable=False, server_default="0"),
-    )
-    op.add_column(
-        "worlds",
-        sa.Column("last_played_at", sa.DateTime(timezone=True), nullable=True),
-    )
-
-    # B-tree index on category, GIN index on tags.
-    op.create_index(
-        "ix_worlds_category",
-        "worlds",
-        ["category"],
-        unique=False,
-    )
-    op.create_index(
-        "ix_worlds_tags",
-        "worlds",
-        ["tags"],
-        unique=False,
-        postgresql_using="gin",
-    )
-
-    # Create world_visits table.
-    op.create_table(
-        "world_visits",
-        sa.Column("id", sa.Integer(), primary_key=True),
-        sa.Column("world_id", sa.Integer(), nullable=False),
-        sa.Column("user_id", sa.Integer(), nullable=True),
-        sa.Column("anonymous_token", sa.String(length=255), nullable=True),
-        sa.Column(
-            "visited_at",
-            sa.DateTime(timezone=True),
-            server_default=sa.func.now(),
-        ),
-        sa.ForeignKeyConstraint(
-            ["world_id"], ["worlds.id"], ondelete="CASCADE"
-        ),
-        sa.ForeignKeyConstraint(
-            ["user_id"], ["users.id"], ondelete="CASCADE"
-        ),
-    )
-    op.create_index(
-        op.f("ix_world_visits_id"), "world_visits", ["id"], unique=False
-    )
-    op.create_index(
-        "ix_world_visits_world_id_visited_at",
-        "world_visits",
-        ["world_id", "visited_at"],
-        unique=False,
-    )
-
-
-def downgrade() -> None:
-    """Drop world_visits and discovery metadata columns from worlds."""
-    op.drop_index(
-        "ix_world_visits_world_id_visited_at", table_name="world_visits"
-    )
-    op.drop_index(op.f("ix_world_visits_id"), table_name="world_visits")
-    op.drop_table("world_visits")
-
-    op.drop_index("ix_worlds_tags", table_name="worlds")
-    op.drop_index("ix_worlds_category", table_name="worlds")
-    op.drop_column("worlds", "last_played_at")
-    op.drop_column("worlds", "play_count")
-    op.drop_column("worlds", "tags")
-    op.drop_column("worlds", "category")

backend/app/models/__init__.py

@@ -2,6 +2,5 @@ from app.models.user import User
 from app.models.session import Session
 from app.models.world import World
 from app.models.asset import Asset
-from app.models.world_visit import WorldVisit
 
-__all__ = ["User", "Session", "World", "Asset", "WorldVisit"]
+__all__ = ["User", "Session", "World", "Asset"]

backend/app/models/asset.py

@@ -3,6 +3,10 @@ from sqlalchemy.dialects.postgresql import ENUM
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 import enum
+import json
+from typing import Optional, List
+
+from pydantic import BaseModel as PydanticBaseModel
 
 from app.database import Base
 
@@ -38,3 +42,31 @@ class Asset(Base):
 
     owner = relationship("User", back_populates="assets")
     world = relationship("World", back_populates="assets")
+
+
+class GLTFMetadata(PydanticBaseModel):
+    """Pydantic schema for glTF asset metadata."""
+    mesh_count: Optional[int] = None
+    vertex_count: Optional[int] = None
+    has_animation: bool = False
+    texture_refs: Optional[List[str]] = None
+    tags: Optional[List[str]] = None
+
+    model_config = {"from_attributes": True}
+
+
+def parse_metadata_json(metadata_text: Optional[str]) -> dict:
+    """Parse the metadata_json text field into a dict, handling None gracefully."""
+    if not metadata_text:
+        return {}
+    try:
+        return json.loads(metadata_text)
+    except (json.JSONDecodeError, TypeError):
+        return {}
+
+
+def serialize_metadata(metadata: dict) -> Optional[str]:
+    """Serialize metadata dict to JSON string for storage."""
+    if not metadata:
+        return None
+    return json.dumps(metadata)

backend/app/models/world.py

@@ -1,4 +1,4 @@
-from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, ARRAY, Index
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey
 from sqlalchemy.dialects.postgresql import ENUM
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
@@ -27,17 +27,5 @@ class World(Base):
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), onupdate=func.now())
 
-    # Discovery metadata
-    category = Column(String(100), nullable=True, index=True)
-    tags = Column(ARRAY(String), nullable=True, server_default="{}")
-    play_count = Column(Integer, nullable=False, server_default="0")
-    last_played_at = Column(DateTime(timezone=True), nullable=True)
-
-    # GIN index on tags for efficient tag-based queries
-    __table_args__ = (
-        Index("ix_worlds_tags", "tags", postgresql_using="gin"),
-    )
-
     owner = relationship("User", back_populates="worlds")
     assets = relationship("Asset", back_populates="world", cascade="all, delete-orphan")
-    visits = relationship("WorldVisit", back_populates="world", cascade="all, delete-orphan")

backend/app/models/world_visit.py

@@ -1,26 +0,0 @@
-from sqlalchemy import Column, DateTime, ForeignKey, Index, Integer, String
-from sqlalchemy.orm import relationship
-from sqlalchemy.sql import func
-
-from app.database import Base
-
-
-class WorldVisit(Base):
-    __tablename__ = "world_visits"
-
-    id = Column(Integer, primary_key=True, index=True)
-    world_id = Column(
-        Integer, ForeignKey("worlds.id", ondelete="CASCADE"), nullable=False
-    )
-    user_id = Column(
-        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=True
-    )
-    anonymous_token = Column(String(255), nullable=True)
-    visited_at = Column(DateTime(timezone=True), server_default=func.now())
-
-    __table_args__ = (
-        Index("ix_world_visits_world_id_visited_at", "world_id", "visited_at"),
-    )
-
-    world = relationship("World", back_populates="visits")
-    user = relationship("User")