diff --git a/src/proxy_pool/accounts/models.py b/src/proxy_pool/accounts/models.py
new file mode 100644
index 0000000..c57ea6b
--- /dev/null
+++ b/src/proxy_pool/accounts/models.py
@@ -0,0 +1,78 @@
+import enum
+import uuid
+from datetime import datetime
+
+from sqlalchemy import ForeignKey, Index, Integer, String, Text, func
+from sqlalchemy.dialects.postgresql import ENUM
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from proxy_pool.db.base import Base, TimestampMixin, UUIDPrimaryKeyMixin
+
+
+class CreditTxType(str, enum.Enum):
+    PURCHASE = "purchase"
+    ACQUIRE = "acquire"
+    REFUND = "refund"
+    ADMIN_ADJUST = "admin_adjust"
+
+
+class User(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "users"
+
+    email: Mapped[str] = mapped_column(String(320), unique=True)
+    display_name: Mapped[str | None] = mapped_column(String(128))
+    is_active: Mapped[bool] = mapped_column(default=True)
+
+    api_keys: Mapped[list["ApiKey"]] = relationship(back_populates="user")
+    credit_entries: Mapped[list["CreditLedger"]] = relationship(back_populates="user")
+
+
+class ApiKey(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "api_keys"
+    __table_args__ = (
+        Index("ix_api_keys_hash", "key_hash", unique=True),
+        Index("ix_api_keys_prefix", "prefix"),
+    )
+
+    user_id: Mapped[uuid.UUID] = mapped_column(
+        ForeignKey("users.id", ondelete="CASCADE"),
+    )
+    key_hash: Mapped[str] = mapped_column(String(128))
+    prefix: Mapped[str] = mapped_column(String(8))
+    label: Mapped[str | None] = mapped_column(String(128))
+    is_active: Mapped[bool] = mapped_column(default=True)
+    last_used_at: Mapped[datetime | None] = mapped_column()
+    expires_at: Mapped[datetime | None] = mapped_column()
+
+    user: Mapped["User"] = relationship(back_populates="api_keys")
+
+
+class CreditLedger(UUIDPrimaryKeyMixin, TimestampMixin, Base):
+    __tablename__ = "credit_ledger"
+    __table_args__ = (Index("ix_ledger_user_created", "user_id", "created_at"),)
+
+    user_id: Mapped[uuid.UUID] = mapped_column(
+        ForeignKey("users.id", ondelete="CASCADE"),
+    )
+    amount: Mapped[int] = mapped_column(Integer)
+    tx_type: Mapped[CreditTxType] = mapped_column(
+        ENUM(CreditTxType, name="credit_tx_type"),
+    )
+    description: Mapped[str | None] = mapped_column(Text)
+    reference_id: Mapped[uuid.UUID | None] = mapped_column()
+
+    user: Mapped["User"] = relationship(back_populates="credit_entries")
+
+
+class ProxyLease(UUIDPrimaryKeyMixin, Base):
+    __tablename__ = "proxy_leases"
+    __table_args__ = (
+        Index("ix_leases_user", "user_id"),
+        Index("ix_leases_proxy_active", "proxy_id", "is_released"),
+    )
+
+    user_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("users.id"))
+    proxy_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("proxies.id"))
+    acquired_at: Mapped[datetime] = mapped_column(server_default=func.now())
+    expires_at: Mapped[datetime] = mapped_column()
+    is_released: Mapped[bool] = mapped_column(default=False)