Add project setup some models and a test

src/allmende_payment_system/models.py

@@ -0,0 +1,39 @@
+from sqlalchemy import Column, ForeignKey, Table
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
+
+TABLE_PREFIX = "aps_"
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class Account(Base):
+    __tablename__ = TABLE_PREFIX + "account"
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    name: Mapped[str] = mapped_column(nullable=False, unique=True)
+
+    users: Mapped[list["User"]] = relationship(
+        "User",
+        secondary=TABLE_PREFIX + "user_account_association",
+        back_populates="accounts",
+    )
+
+
+user_account_association = Table(
+    TABLE_PREFIX + "user_account_association",
+    Base.metadata,
+    Column("user_id", ForeignKey(TABLE_PREFIX + "user.id"), primary_key=True),
+    Column("account_id", ForeignKey(TABLE_PREFIX + "account.id"), primary_key=True),
+)
+
+
+class User(Base):
+    __tablename__ = TABLE_PREFIX + "user"
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    username: Mapped[str] = mapped_column(nullable=False, unique=True)
+    display_name: Mapped[str] = mapped_column(nullable=False)
+
+    accounts: Mapped[list["Account"]] = relationship(
+        "Account", secondary=user_account_association, back_populates="users"
+    )