Initial certificate system

backend/app/models/learner.py

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+from datetime import datetime
+
+from sqlalchemy import DateTime, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base
+
+
+class Learner(Base):
+    __tablename__ = "learners"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    phone: Mapped[str] = mapped_column(String(32), unique=True, index=True)
+    current_name: Mapped[str] = mapped_column(String(64), index=True)
+    id_type: Mapped[str | None] = mapped_column(String(32), nullable=True)
+    id_no_encrypted: Mapped[str | None] = mapped_column(String(256), nullable=True)
+    id_no_masked: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    student_no: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    status: Mapped[str] = mapped_column(String(32), default="active")
+    remark: Mapped[str | None] = mapped_column(Text, nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+
+class LearnerNameHistory(Base):
+    __tablename__ = "learner_name_histories"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    learner_id: Mapped[int] = mapped_column(index=True)
+    name: Mapped[str] = mapped_column(String(64))
+    source: Mapped[str] = mapped_column(String(64), default="import")
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+
+
+class LearnerPhoneHistory(Base):
+    __tablename__ = "learner_phone_histories"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    learner_id: Mapped[int] = mapped_column(index=True)
+    old_phone: Mapped[str] = mapped_column(String(32))
+    new_phone: Mapped[str] = mapped_column(String(32))
+    reason: Mapped[str] = mapped_column(String(255))
+    changed_by: Mapped[int | None] = mapped_column(nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)