add interest accural test, improve migration tests

backend/tests/test_crud.py

@@ -137,6 +137,16 @@ def _ensure_utc_aware(dt: datetime | None) -> datetime | None:
     return dt.astimezone(timezone.utc)
 
 
+def _validate_timestamp(actual: datetime, expected: datetime, tolerance: timedelta) -> None:
+    actual_utc = _ensure_utc_aware(actual)
+    expected_utc = _ensure_utc_aware(expected)
+    assert actual_utc is not None
+    assert expected_utc is not None
+    delta = abs(actual_utc - expected_utc)
+    assert delta <= tolerance, f"Timestamps differ by {delta}, which exceeds tolerance of {tolerance}"
+
+
+# Trades
 def test_create_trade_success_with_cycle(session: Session) -> None:
     user_id = make_user(session)
     exchange_id = make_exchange(session, user_id)
@@ -554,6 +564,7 @@ def test_replace_trade(session: Session) -> None:
     assert actual_new_trade.replaced_by_trade_id == old_trade_id
 
 
+# Cycles
 def test_create_cycle(session: Session) -> None:
     user_id = make_user(session)
     exchange_id = make_exchange(session, user_id)
@@ -656,6 +667,216 @@ def test_update_cycle_immutable_fields(session: Session) -> None:
     )
 
 
+# Cycle loans
+def test_create_cycle_loan_event(session: Session) -> None:
+    user_id = make_user(session)
+    exchange_id = make_exchange(session, user_id)
+    cycle_id = make_cycle(session, user_id, exchange_id)
+
+    loan_data = {
+        "cycle_id": cycle_id,
+        "loan_amount_cents": 100000,
+        "loan_interest_rate_tenth_bps": 5000,  # 5%
+        "notes": "Test loan change for the cycle",
+    }
+
+    loan_event = crud.create_cycle_loan_event(session, loan_data)
+    now = datetime.now(timezone.utc)
+    assert loan_event.id is not None
+    assert loan_event.cycle_id == cycle_id
+    assert loan_event.loan_amount_cents == loan_data["loan_amount_cents"]
+    assert loan_event.loan_interest_rate_tenth_bps == loan_data["loan_interest_rate_tenth_bps"]
+    assert loan_event.notes == loan_data["notes"]
+    assert loan_event.effective_date == now.date()
+    _validate_timestamp(loan_event.created_at, now, timedelta(seconds=1))
+
+    session.refresh(loan_event)
+    actual_loan_event = session.get(models.CycleLoanChangeEvents, loan_event.id)
+    assert actual_loan_event is not None
+    assert actual_loan_event.cycle_id == cycle_id
+    assert actual_loan_event.loan_amount_cents == loan_data["loan_amount_cents"]
+    assert actual_loan_event.loan_interest_rate_tenth_bps == loan_data["loan_interest_rate_tenth_bps"]
+    assert actual_loan_event.notes == loan_data["notes"]
+    assert actual_loan_event.effective_date == now.date()
+    _validate_timestamp(actual_loan_event.created_at, now, timedelta(seconds=1))
+
+
+def test_get_cycle_loan_events_by_cycle_id(session: Session) -> None:
+    user_id = make_user(session)
+    exchange_id = make_exchange(session, user_id)
+    cycle_id = make_cycle(session, user_id, exchange_id)
+
+    loan_data_1 = {
+        "cycle_id": cycle_id,
+        "loan_amount_cents": 100000,
+        "loan_interest_rate_tenth_bps": 5000,
+        "notes": "First loan event",
+    }
+    yesterday = (datetime.now(timezone.utc) - timedelta(days=1)).date()
+    loan_data_2 = {
+        "cycle_id": cycle_id,
+        "loan_amount_cents": 150000,
+        "loan_interest_rate_tenth_bps": 4500,
+        "effective_date": yesterday,
+        "notes": "Second loan event",
+    }
+
+    crud.create_cycle_loan_event(session, loan_data_1)
+    crud.create_cycle_loan_event(session, loan_data_2)
+
+    loan_events = crud.get_loan_events_by_cycle_id(session, cycle_id)
+    assert len(loan_events) == 2
+    notes = [event.notes for event in loan_events]
+    assert loan_events[0].notes == loan_data_2["notes"]
+    assert loan_events[0].effective_date == yesterday
+    assert notes == ["Second loan event", "First loan event"]  # Ordered by effective_date desc
+
+
+def test_get_cycle_loan_events_by_cycle_id_same_date(session: Session) -> None:
+    user_id = make_user(session)
+    exchange_id = make_exchange(session, user_id)
+    cycle_id = make_cycle(session, user_id, exchange_id)
+
+    loan_data_1 = {
+        "cycle_id": cycle_id,
+        "loan_amount_cents": 100000,
+        "loan_interest_rate_tenth_bps": 5000,
+        "notes": "First loan event",
+    }
+    loan_data_2 = {
+        "cycle_id": cycle_id,
+        "loan_amount_cents": 150000,
+        "loan_interest_rate_tenth_bps": 4500,
+        "notes": "Second loan event",
+    }
+
+    crud.create_cycle_loan_event(session, loan_data_1)
+    crud.create_cycle_loan_event(session, loan_data_2)
+
+    loan_events = crud.get_loan_events_by_cycle_id(session, cycle_id)
+    assert len(loan_events) == 2
+    notes = [event.notes for event in loan_events]
+    assert notes == ["First loan event", "Second loan event"]  # Ordered by id desc when effective_date is same
+
+
+def test_create_cycle_loan_event_single_field(session: Session) -> None:
+    user_id = make_user(session)
+    exchange_id = make_exchange(session, user_id)
+    cycle_id = make_cycle(session, user_id, exchange_id)
+
+    loan_data = {
+        "cycle_id": cycle_id,
+        "loan_amount_cents": 200000,
+    }
+
+    loan_event = crud.create_cycle_loan_event(session, loan_data)
+    now = datetime.now(timezone.utc)
+    assert loan_event.id is not None
+    assert loan_event.cycle_id == cycle_id
+    assert loan_event.loan_amount_cents == loan_data["loan_amount_cents"]
+    assert loan_event.loan_interest_rate_tenth_bps is None
+    assert loan_event.notes is None
+    assert loan_event.effective_date == now.date()
+    _validate_timestamp(loan_event.created_at, now, timedelta(seconds=1))
+
+    session.refresh(loan_event)
+    actual_loan_event = session.get(models.CycleLoanChangeEvents, loan_event.id)
+    assert actual_loan_event is not None
+    assert actual_loan_event.cycle_id == cycle_id
+    assert actual_loan_event.loan_amount_cents == loan_data["loan_amount_cents"]
+    assert actual_loan_event.loan_interest_rate_tenth_bps is None
+    assert actual_loan_event.notes is None
+    assert actual_loan_event.effective_date == now.date()
+    _validate_timestamp(actual_loan_event.created_at, now, timedelta(seconds=1))
+
+
+def test_create_cycle_daily_accrual(session: Session) -> None:
+    user_id = make_user(session)
+    exchange_id = make_exchange(session, user_id)
+    cycle_id = make_cycle(session, user_id, exchange_id)
+    today = datetime.now(timezone.utc).date()
+    accrual_data = {
+        "cycle_id": cycle_id,
+        "accrual_date": today,
+        "accrued_interest_cents": 150,
+        "notes": "Daily interest accrual",
+    }
+
+    accrual = crud.create_cycle_daily_accrual(session, cycle_id, accrual_data["accrual_date"], accrual_data["accrued_interest_cents"])
+    assert accrual.id is not None
+    assert accrual.cycle_id == cycle_id
+    assert accrual.accrual_date == accrual_data["accrual_date"]
+    assert accrual.accrual_amount_cents == accrual_data["accrued_interest_cents"]
+
+    session.refresh(accrual)
+    actual_accrual = session.get(models.CycleDailyAccrual, accrual.id)
+    assert actual_accrual is not None
+    assert actual_accrual.cycle_id == cycle_id
+    assert actual_accrual.accrual_date == accrual_data["accrual_date"]
+    assert actual_accrual.accrual_amount_cents == accrual_data["accrued_interest_cents"]
+
+
+def test_get_cycle_daily_accruals_by_cycle_id(session: Session) -> None:
+    user_id = make_user(session)
+    exchange_id = make_exchange(session, user_id)
+    cycle_id = make_cycle(session, user_id, exchange_id)
+
+    today = datetime.now(timezone.utc).date()
+    yesterday = today - timedelta(days=1)
+
+    accrual_data_1 = {
+        "cycle_id": cycle_id,
+        "accrual_date": yesterday,
+        "accrued_interest_cents": 100,
+    }
+    accrual_data_2 = {
+        "cycle_id": cycle_id,
+        "accrual_date": today,
+        "accrued_interest_cents": 150,
+    }
+
+    crud.create_cycle_daily_accrual(session, cycle_id, accrual_data_1["accrual_date"], accrual_data_1["accrued_interest_cents"])
+    crud.create_cycle_daily_accrual(session, cycle_id, accrual_data_2["accrual_date"], accrual_data_2["accrued_interest_cents"])
+
+    accruals = crud.get_cycle_daily_accruals_by_cycle_id(session, cycle_id)
+    assert len(accruals) == 2
+    dates = [accrual.accrual_date for accrual in accruals]
+    assert dates == [yesterday, today]  # Ordered by accrual_date asc
+
+
+def test_get_cycle_daily_accruals_by_cycle_id_and_date(session: Session) -> None:
+    user_id = make_user(session)
+    exchange_id = make_exchange(session, user_id)
+    cycle_id = make_cycle(session, user_id, exchange_id)
+
+    today = datetime.now(timezone.utc).date()
+    yesterday = today - timedelta(days=1)
+
+    accrual_data_1 = {
+        "cycle_id": cycle_id,
+        "accrual_date": yesterday,
+        "accrued_interest_cents": 100,
+    }
+    accrual_data_2 = {
+        "cycle_id": cycle_id,
+        "accrual_date": today,
+        "accrued_interest_cents": 150,
+    }
+
+    crud.create_cycle_daily_accrual(session, cycle_id, accrual_data_1["accrual_date"], accrual_data_1["accrued_interest_cents"])
+    crud.create_cycle_daily_accrual(session, cycle_id, accrual_data_2["accrual_date"], accrual_data_2["accrued_interest_cents"])
+
+    accruals_today = crud.get_cycle_daily_accrual_by_cycle_id_and_date(session, cycle_id, today)
+    assert accruals_today is not None
+    assert accruals_today.accrual_date == today
+    assert accruals_today.accrual_amount_cents == accrual_data_2["accrued_interest_cents"]
+
+    accruals_yesterday = crud.get_cycle_daily_accrual_by_cycle_id_and_date(session, cycle_id, yesterday)
+    assert accruals_yesterday is not None
+    assert accruals_yesterday.accrual_date == yesterday
+    assert accruals_yesterday.accrual_amount_cents == accrual_data_1["accrued_interest_cents"]
+
+
 # Exchanges
 def test_create_exchange(session: Session) -> None:
     user_id = make_user(session)

backend/tests/test_db_migration.py

@@ -45,6 +45,8 @@ def test_run_migrations_0_to_1(monkeypatch: pytest.MonkeyPatch) -> None:
                 "loan_interest_rate_tenth_bps": ("INTEGER", 0, 0),
                 "start_date": ("DATE", 1, 0),
                 "end_date": ("DATE", 0, 0),
+                "latest_interest_accrued_date": ("DATE", 0, 0),
+                "total_accrued_amount_cents": ("INTEGER", 1, 0),
             },
             "cycle_loan_change_events": {
                 "id": ("INTEGER", 1, 1),
@@ -170,6 +172,39 @@ def test_run_migrations_0_to_1(monkeypatch: pytest.MonkeyPatch) -> None:
                 actual_fk_list = [{"table": r[2], "from": r[3], "to": r[4]} for r in fk_rows]
                 for efk in fks:
                     assert efk in actual_fk_list, f"missing FK on {tbl_name}: {efk}"
+
+            # check trades.replaced_by_trade_id self-referential FK
+            fk_rows = conn.execute(text("PRAGMA foreign_key_list('trades')")).fetchall()
+            actual_fk_list = [{"table": r[2], "from": r[3], "to": r[4]} for r in fk_rows]
+            assert {"table": "trades", "from": "replaced_by_trade_id", "to": "id"} in actual_fk_list, (
+                "missing self FK trades.replaced_by_trade_id -> trades.id"
+            )
+
+            # helper to find unique index on a column
+            def has_unique_index(table: str, column: str) -> bool:
+                idx_rows = conn.execute(text(f"PRAGMA index_list('{table}')")).fetchall()
+                for idx in idx_rows:
+                    idx_name = idx[1]
+                    is_unique = bool(idx[2])
+                    if not is_unique:
+                        continue
+                    info = conn.execute(text(f"PRAGMA index_info('{idx_name}')")).fetchall()
+                    cols = [r[2] for r in info]
+                    if column in cols:
+                        return True
+                return False
+
+            assert has_unique_index("trades", "friendly_name"), (
+                "expected unique index on trades(friendly_name) per uq_trades_user_friendly_name"
+            )
+            assert has_unique_index("cycles", "friendly_name"), (
+                "expected unique index on cycles(friendly_name) per uq_cycles_user_friendly_name"
+            )
+            assert has_unique_index("exchanges", "name"), "expected unique index on exchanges(name) per uq_exchanges_user_name"
+            assert has_unique_index("sessions", "session_token_hash"), "expected unique index on sessions(session_token_hash)"
+            assert has_unique_index("cycle_loan_change_events", "related_trade_id"), (
+                "expected unique index on cycle_loan_change_events(related_trade_id)"
+            )
     finally:
         engine.dispose()
         SQLModel.metadata.clear()

backend/trading_journal/crud.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from datetime import datetime, timedelta, timezone
+from datetime import date, datetime, timedelta, timezone
 from typing import TYPE_CHECKING, Any, TypeVar, cast
 
 from pydantic import BaseModel
@@ -13,6 +13,8 @@ if TYPE_CHECKING:
     from collections.abc import Mapping
     from enum import Enum
 
+    from sqlalchemy.sql.elements import ColumnElement
+
 
 # Generic enum member type
 T = TypeVar("T", bound="Enum")
@@ -301,6 +303,93 @@ def update_cycle(session: Session, cycle_id: int, update_data: Mapping[str, Any]
     return cycle
 
 
+# Cycle loan and interest
+def create_cycle_loan_event(session: Session, loan_data: Mapping[str, Any] | BaseModel) -> models.CycleLoanChangeEvents:
+    data = _data_to_dict(loan_data)
+    allowed = _allowed_columns(models.CycleLoanChangeEvents)
+    payload = {k: v for k, v in data.items() if k in allowed}
+    if "cycle_id" not in payload:
+        raise ValueError("cycle_id is required")
+    cycle = session.get(models.Cycles, payload["cycle_id"])
+    if cycle is None:
+        raise ValueError("cycle_id does not exist")
+
+    payload["effective_date"] = payload.get("effective_date") or datetime.now(timezone.utc).date()
+    payload["created_at"] = datetime.now(timezone.utc)
+    cle = models.CycleLoanChangeEvents(**payload)
+    session.add(cle)
+    try:
+        session.flush()
+    except IntegrityError as e:
+        session.rollback()
+        raise ValueError("create_cycle_loan_event integrity error") from e
+    session.refresh(cle)
+    return cle
+
+
+def get_loan_events_by_cycle_id(session: Session, cycle_id: int) -> list[models.CycleLoanChangeEvents]:
+    eff_col = cast("ColumnElement", models.CycleLoanChangeEvents.effective_date)
+    id_col = cast("ColumnElement", models.CycleLoanChangeEvents.id)
+    statement = (
+        select(models.CycleLoanChangeEvents)
+        .where(
+            models.CycleLoanChangeEvents.cycle_id == cycle_id,
+        )
+        .order_by(eff_col, id_col.asc())
+    )
+    return list(session.exec(statement).all())
+
+
+def create_cycle_daily_accrual(session: Session, cycle_id: int, accrual_date: date, accrual_amount_cents: int) -> models.CycleDailyAccrual:
+    cycle = session.get(models.Cycles, cycle_id)
+    if cycle is None:
+        raise ValueError("cycle_id does not exist")
+    existing = session.exec(
+        select(models.CycleDailyAccrual).where(
+            models.CycleDailyAccrual.cycle_id == cycle_id,
+            models.CycleDailyAccrual.accrual_date == accrual_date,
+        ),
+    ).first()
+    if existing:
+        return existing
+    if accrual_amount_cents < 0:
+        raise ValueError("accrual_amount_cents must be non-negative")
+    row = models.CycleDailyAccrual(
+        cycle_id=cycle_id,
+        accrual_date=accrual_date,
+        accrual_amount_cents=accrual_amount_cents,
+        created_at=datetime.now(timezone.utc),
+    )
+    session.add(row)
+    try:
+        session.flush()
+    except IntegrityError as e:
+        session.rollback()
+        raise ValueError("create_cycle_daily_accrual integrity error") from e
+    session.refresh(row)
+    return row
+
+
+def get_cycle_daily_accruals_by_cycle_id(session: Session, cycle_id: int) -> list[models.CycleDailyAccrual]:
+    date_col = cast("ColumnElement", models.CycleDailyAccrual.accrual_date)
+    statement = (
+        select(models.CycleDailyAccrual)
+        .where(
+            models.CycleDailyAccrual.cycle_id == cycle_id,
+        )
+        .order_by(date_col.asc())
+    )
+    return list(session.exec(statement).all())
+
+
+def get_cycle_daily_accrual_by_cycle_id_and_date(session: Session, cycle_id: int, accrual_date: date) -> models.CycleDailyAccrual | None:
+    statement = select(models.CycleDailyAccrual).where(
+        models.CycleDailyAccrual.cycle_id == cycle_id,
+        models.CycleDailyAccrual.accrual_date == accrual_date,
+    )
+    return session.exec(statement).first()
+
+
 # Exchanges
 IMMUTABLE_EXCHANGE_FIELDS = {"id"}
 

backend/trading_journal/models.py

@@ -18,8 +18,10 @@ from sqlmodel import (
 
 class TradeType(str, Enum):
     SELL_PUT = "SELL_PUT"
+    CLOSE_SELL_PUT = "CLOSE_SELL_PUT"
     ASSIGNMENT = "ASSIGNMENT"
     SELL_CALL = "SELL_CALL"
+    CLOSE_SELL_CALL = "CLOSE_SELL_CALL"
     EXERCISE_CALL = "EXERCISE_CALL"
     LONG_SPOT = "LONG_SPOT"
     CLOSE_LONG_SPOT = "CLOSE_LONG_SPOT"
@@ -117,13 +119,17 @@ class Cycles(SQLModel, table=True):
     status: CycleStatus = Field(sa_column=Column(Text, nullable=False))
     funding_source: FundingSource = Field(sa_column=Column(Text, nullable=True))
     capital_exposure_cents: int | None = Field(default=None, nullable=True)
-    loan_amount_cents: int | None = Field(default=None, nullable=True)
-    loan_interest_rate_tenth_bps: int | None = Field(default=None, nullable=True)
     start_date: date = Field(sa_column=Column(Date, nullable=False))
     end_date: date | None = Field(default=None, sa_column=Column(Date, nullable=True))
 
     trades: list["Trades"] = Relationship(back_populates="cycle")
 
+    loan_amount_cents: int | None = Field(default=None, nullable=True)
+    loan_interest_rate_tenth_bps: int | None = Field(default=None, nullable=True)
+
+    latest_interest_accrued_date: date | None = Field(default=None, sa_column=Column(Date, nullable=True))
+    total_accrued_amount_cents: int = Field(default=0, sa_column=Column(Integer, nullable=False))
+
     loan_change_events: list["CycleLoanChangeEvents"] = Relationship(back_populates="cycle")
     daily_accruals: list["CycleDailyAccrual"] = Relationship(back_populates="cycle")
 
@@ -131,7 +137,7 @@ class Cycles(SQLModel, table=True):
 class CycleLoanChangeEvents(SQLModel, table=True):
     __tablename__ = "cycle_loan_change_events"  # type: ignore[attr-defined]
     id: int | None = Field(default=None, primary_key=True)
-    cycle_id: int = Field(foreign_key="cycles.id", nullable=False, index=True)
+    cycle_id: int = Field(sa_column=Column(Integer, ForeignKey("cycles.id", ondelete="CASCADE"), nullable=False, index=True))
     effective_date: date = Field(sa_column=Column(Date, nullable=False))
     loan_amount_cents: int | None = Field(default=None, sa_column=Column(Integer, nullable=True))
     loan_interest_rate_tenth_bps: int | None = Field(default=None, sa_column=Column(Integer, nullable=True))
@@ -148,7 +154,7 @@ class CycleDailyAccrual(SQLModel, table=True):
     __table_args__ = (UniqueConstraint("cycle_id", "accrual_date", name="uq_cycle_daily_accruals_cycle_date"),)
 
     id: int | None = Field(default=None, primary_key=True)
-    cycle_id: int = Field(foreign_key="cycles.id", nullable=False, index=True)
+    cycle_id: int = Field(sa_column=Column(Integer, ForeignKey("cycles.id", ondelete="CASCADE"), nullable=False, index=True))
     accrual_date: date = Field(sa_column=Column(Date, nullable=False))
     accrual_amount_cents: int = Field(sa_column=Column(Integer, nullable=False))
     created_at: datetime = Field(sa_column=Column(DateTime(timezone=True), nullable=False))

backend/trading_journal/models_v1.py

@@ -18,8 +18,10 @@ from sqlmodel import (
 
 class TradeType(str, Enum):
     SELL_PUT = "SELL_PUT"
+    CLOSE_SELL_PUT = "CLOSE_SELL_PUT"
     ASSIGNMENT = "ASSIGNMENT"
     SELL_CALL = "SELL_CALL"
+    CLOSE_SELL_CALL = "CLOSE_SELL_CALL"
     EXERCISE_CALL = "EXERCISE_CALL"
     LONG_SPOT = "LONG_SPOT"
     CLOSE_LONG_SPOT = "CLOSE_LONG_SPOT"
@@ -117,13 +119,17 @@ class Cycles(SQLModel, table=True):
     status: CycleStatus = Field(sa_column=Column(Text, nullable=False))
     funding_source: FundingSource = Field(sa_column=Column(Text, nullable=True))
     capital_exposure_cents: int | None = Field(default=None, nullable=True)
-    loan_amount_cents: int | None = Field(default=None, nullable=True)
-    loan_interest_rate_tenth_bps: int | None = Field(default=None, nullable=True)
     start_date: date = Field(sa_column=Column(Date, nullable=False))
     end_date: date | None = Field(default=None, sa_column=Column(Date, nullable=True))
 
     trades: list["Trades"] = Relationship(back_populates="cycle")
 
+    loan_amount_cents: int | None = Field(default=None, nullable=True)
+    loan_interest_rate_tenth_bps: int | None = Field(default=None, nullable=True)
+
+    latest_interest_accrued_date: date | None = Field(default=None, sa_column=Column(Date, nullable=True))
+    total_accrued_amount_cents: int = Field(default=0, sa_column=Column(Integer, nullable=False))
+
     loan_change_events: list["CycleLoanChangeEvents"] = Relationship(back_populates="cycle")
     daily_accruals: list["CycleDailyAccrual"] = Relationship(back_populates="cycle")
 
@@ -131,7 +137,7 @@ class Cycles(SQLModel, table=True):
 class CycleLoanChangeEvents(SQLModel, table=True):
     __tablename__ = "cycle_loan_change_events"  # type: ignore[attr-defined]
     id: int | None = Field(default=None, primary_key=True)
-    cycle_id: int = Field(foreign_key="cycles.id", nullable=False, index=True)
+    cycle_id: int = Field(sa_column=Column(Integer, ForeignKey("cycles.id", ondelete="CASCADE"), nullable=False, index=True))
     effective_date: date = Field(sa_column=Column(Date, nullable=False))
     loan_amount_cents: int | None = Field(default=None, sa_column=Column(Integer, nullable=True))
     loan_interest_rate_tenth_bps: int | None = Field(default=None, sa_column=Column(Integer, nullable=True))
@@ -148,7 +154,7 @@ class CycleDailyAccrual(SQLModel, table=True):
     __table_args__ = (UniqueConstraint("cycle_id", "accrual_date", name="uq_cycle_daily_accruals_cycle_date"),)
 
     id: int | None = Field(default=None, primary_key=True)
-    cycle_id: int = Field(foreign_key="cycles.id", nullable=False, index=True)
+    cycle_id: int = Field(sa_column=Column(Integer, ForeignKey("cycles.id", ondelete="CASCADE"), nullable=False, index=True))
     accrual_date: date = Field(sa_column=Column(Date, nullable=False))
     accrual_amount_cents: int = Field(sa_column=Column(Integer, nullable=False))
     created_at: datetime = Field(sa_column=Column(DateTime(timezone=True), nullable=False))