diff --git a/backend/tests/test_db_migration.py b/backend/tests/test_db_migration.py
index 042bb54..f14b2da 100644
--- a/backend/tests/test_db_migration.py
+++ b/backend/tests/test_db_migration.py
@@ -46,6 +46,23 @@ def test_run_migrations_0_to_1(monkeypatch: pytest.MonkeyPatch) -> None:
                 "start_date": ("DATE", 1, 0),
                 "end_date": ("DATE", 0, 0),
             },
+            "cycle_loan_change_events": {
+                "id": ("INTEGER", 1, 1),
+                "cycle_id": ("INTEGER", 1, 0),
+                "effective_date": ("DATE", 1, 0),
+                "loan_amount_cents": ("INTEGER", 0, 0),
+                "loan_interest_rate_tenth_bps": ("INTEGER", 0, 0),
+                "related_trade_id": ("INTEGER", 0, 0),
+                "notes": ("TEXT", 0, 0),
+                "created_at": ("DATETIME", 1, 0),
+            },
+            "cycle_daily_accrual": {
+                "id": ("INTEGER", 1, 1),
+                "cycle_id": ("INTEGER", 1, 0),
+                "accrual_date": ("DATE", 1, 0),
+                "accrual_amount_cents": ("INTEGER", 1, 0),
+                "created_at": ("DATETIME", 1, 0),
+            },
             "trades": {
                 "id": ("INTEGER", 1, 1),
                 "user_id": ("INTEGER", 1, 0),
@@ -100,6 +117,13 @@ def test_run_migrations_0_to_1(monkeypatch: pytest.MonkeyPatch) -> None:
                 {"table": "users", "from": "user_id", "to": "id"},
                 {"table": "exchanges", "from": "exchange_id", "to": "id"},
             ],
+            "cycle_loan_change_events": [
+                {"table": "cycles", "from": "cycle_id", "to": "id"},
+                {"table": "trades", "from": "related_trade_id", "to": "id"},
+            ],
+            "cycle_daily_accrual": [
+                {"table": "cycles", "from": "cycle_id", "to": "id"},
+            ],
             "sessions": [
                 {"table": "users", "from": "user_id", "to": "id"},
             ],
diff --git a/backend/tests/test_service.py b/backend/tests/test_service.py
new file mode 100644
index 0000000..b23e2be
--- /dev/null
+++ b/backend/tests/test_service.py
@@ -0,0 +1,5 @@
+import pytest
+
+from trading_journal import crud, service
+
+monkeypatch = pytest.MonkeyPatch()
diff --git a/backend/trading_journal/db_migration.py b/backend/trading_journal/db_migration.py
index 8a63250..b6a78ea 100644
--- a/backend/trading_journal/db_migration.py
+++ b/backend/trading_journal/db_migration.py
@@ -28,6 +28,8 @@ def _mig_0_1(engine: Engine) -> None:
             models_v1.Users.__table__,  # type: ignore[attr-defined]
             models_v1.Sessions.__table__,  # type: ignore[attr-defined]
             models_v1.Exchanges.__table__,  # type: ignore[attr-defined]
+            models_v1.CycleLoanChangeEvents.__table__,  # type: ignore[attr-defined]
+            models_v1.CycleDailyAccrual.__table__,  # type: ignore[attr-defined]
         ],
     )
 
diff --git a/backend/trading_journal/models.py b/backend/trading_journal/models.py
index e8dc281..81d98e1 100644
--- a/backend/trading_journal/models.py
+++ b/backend/trading_journal/models.py
@@ -1,11 +1,13 @@
 from datetime import date, datetime
 from enum import Enum
+from typing import Optional
 
 from sqlmodel import (
     Column,
     Date,
     DateTime,
     Field,
+    ForeignKey,
     Integer,
     Relationship,
     SQLModel,
@@ -92,8 +94,14 @@ class Trades(SQLModel, table=True):
     replaced_by_trade_id: int | None = Field(default=None, foreign_key="trades.id", nullable=True)
     notes: str | None = Field(default=None, sa_column=Column(Text, nullable=True))
     cycle_id: int | None = Field(default=None, foreign_key="cycles.id", nullable=True, index=True)
+
     cycle: "Cycles" = Relationship(back_populates="trades")
 
+    related_loan_change_event: Optional["CycleLoanChangeEvents"] = Relationship(
+        back_populates="trade",
+        sa_relationship_kwargs={"uselist": False},
+    )
+
 
 class Cycles(SQLModel, table=True):
     __tablename__ = "cycles"  # type: ignore[attr-defined]
@@ -113,8 +121,40 @@ class Cycles(SQLModel, table=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_change_events: list["CycleLoanChangeEvents"] = Relationship(back_populates="cycle")
+    daily_accruals: list["CycleDailyAccrual"] = Relationship(back_populates="cycle")
+
+
+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)
+    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))
+    related_trade_id: int | None = Field(default=None, sa_column=Column(Integer, ForeignKey("trades.id"), nullable=True, unique=True))
+    notes: str | None = Field(default=None, sa_column=Column(Text, nullable=True))
+    created_at: datetime = Field(sa_column=Column(DateTime(timezone=True), nullable=False))
+
+    cycle: "Cycles" = Relationship(back_populates="loan_change_events")
+    trade: Optional["Trades"] = Relationship(back_populates="related_loan_change_event")
+
+
+class CycleDailyAccrual(SQLModel, table=True):
+    __tablename__ = "cycle_daily_accrual"  # type: ignore[attr-defined]
+    __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)
+    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))
+
+    cycle: "Cycles" = Relationship(back_populates="daily_accruals")
+
 
 class Exchanges(SQLModel, table=True):
     __tablename__ = "exchanges"  # type: ignore[attr-defined]
diff --git a/backend/trading_journal/models_v1.py b/backend/trading_journal/models_v1.py
index e8dc281..81d98e1 100644
--- a/backend/trading_journal/models_v1.py
+++ b/backend/trading_journal/models_v1.py
@@ -1,11 +1,13 @@
 from datetime import date, datetime
 from enum import Enum
+from typing import Optional
 
 from sqlmodel import (
     Column,
     Date,
     DateTime,
     Field,
+    ForeignKey,
     Integer,
     Relationship,
     SQLModel,
@@ -92,8 +94,14 @@ class Trades(SQLModel, table=True):
     replaced_by_trade_id: int | None = Field(default=None, foreign_key="trades.id", nullable=True)
     notes: str | None = Field(default=None, sa_column=Column(Text, nullable=True))
     cycle_id: int | None = Field(default=None, foreign_key="cycles.id", nullable=True, index=True)
+
     cycle: "Cycles" = Relationship(back_populates="trades")
 
+    related_loan_change_event: Optional["CycleLoanChangeEvents"] = Relationship(
+        back_populates="trade",
+        sa_relationship_kwargs={"uselist": False},
+    )
+
 
 class Cycles(SQLModel, table=True):
     __tablename__ = "cycles"  # type: ignore[attr-defined]
@@ -113,8 +121,40 @@ class Cycles(SQLModel, table=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_change_events: list["CycleLoanChangeEvents"] = Relationship(back_populates="cycle")
+    daily_accruals: list["CycleDailyAccrual"] = Relationship(back_populates="cycle")
+
+
+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)
+    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))
+    related_trade_id: int | None = Field(default=None, sa_column=Column(Integer, ForeignKey("trades.id"), nullable=True, unique=True))
+    notes: str | None = Field(default=None, sa_column=Column(Text, nullable=True))
+    created_at: datetime = Field(sa_column=Column(DateTime(timezone=True), nullable=False))
+
+    cycle: "Cycles" = Relationship(back_populates="loan_change_events")
+    trade: Optional["Trades"] = Relationship(back_populates="related_loan_change_event")
+
+
+class CycleDailyAccrual(SQLModel, table=True):
+    __tablename__ = "cycle_daily_accrual"  # type: ignore[attr-defined]
+    __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)
+    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))
+
+    cycle: "Cycles" = Relationship(back_populates="daily_accruals")
+
 
 class Exchanges(SQLModel, table=True):
     __tablename__ = "exchanges"  # type: ignore[attr-defined]