change(fastapi): refactor database ORM model definitions

We don't want to depend on the database to load up data
about the models we define. We now leverage the existing
`aurweb.schema` module for table definitions and set
__table_args__["autoload"] to False.

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/models/package_comment.py

@@ -1,43 +1,33 @@
-from sqlalchemy import Column, ForeignKey, Integer
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import backref, relationship
 
+from aurweb import schema
 from aurweb.models.declarative import Base
 from aurweb.models.package_base import PackageBase as _PackageBase
 from aurweb.models.user import User as _User
 
 
 class PackageComment(Base):
-    __tablename__ = "PackageComments"
+    __table__ = schema.PackageComments
+    __tablename__ = __table__.name
+    __mapper_args__ = {"primary_key": [__table__.c.ID]}
 
-    ID = Column(Integer, primary_key=True)
-
-    PackageBaseID = Column(
-        Integer, ForeignKey("PackageBases.ID", ondelete="CASCADE"),
-        nullable=False)
     PackageBase = relationship(
         _PackageBase, backref=backref("comments", lazy="dynamic",
                                       cascade="all, delete"),
-        foreign_keys=[PackageBaseID])
+        foreign_keys=[__table__.c.PackageBaseID])
 
-    UsersID = Column(Integer, ForeignKey("Users.ID", ondelete="SET NULL"))
     User = relationship(
         _User, backref=backref("package_comments", lazy="dynamic"),
-        foreign_keys=[UsersID])
+        foreign_keys=[__table__.c.UsersID])
 
-    EditedUsersID = Column(
-        Integer, ForeignKey("Users.ID", ondelete="SET NULL"))
     Editor = relationship(
         _User, backref=backref("edited_comments", lazy="dynamic"),
-        foreign_keys=[EditedUsersID])
+        foreign_keys=[__table__.c.EditedUsersID])
 
-    DelUsersID = Column(
-        Integer, ForeignKey("Users.ID", ondelete="SET NULL"))
     Deleter = relationship(
         _User, backref=backref("deleted_comments", lazy="dynamic"),
-        foreign_keys=[DelUsersID])
-
-    __mapper_args__ = {"primary_key": [ID]}
+        foreign_keys=[__table__.c.DelUsersID])
 
     def __init__(self, **kwargs):
         super().__init__(**kwargs)