feat: time tracking / work logs (create, list, summary, project summary, CLI commands)

app/models/worklog.py

@@ -0,0 +1,15 @@
+from sqlalchemy import Column, Integer, Text, DateTime, ForeignKey, Float
+from sqlalchemy.sql import func
+from app.core.config import Base
+
+
+class WorkLog(Base):
+    __tablename__ = "work_logs"
+
+    id = Column(Integer, primary_key=True, index=True)
+    issue_id = Column(Integer, ForeignKey("issues.id"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    hours = Column(Float, nullable=False)  # Hours spent
+    description = Column(Text, nullable=True)
+    logged_date = Column(DateTime(timezone=True), nullable=False)  # When the work was done
+    created_at = Column(DateTime(timezone=True), server_default=func.now())