Add clamp connection

app/models/clamp_connection.py

@@ -0,0 +1,14 @@
+from sqlalchemy import Float
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.database import Base
+
+
+class ClampConnection(Base):
+    __tablename__ = "clamp_connections"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    min_mm: Mapped[float | None] = mapped_column(Float, nullable=True, default=None)
+    max_mm: Mapped[float | None] = mapped_column(Float, nullable=True, default=None)
+    min_in: Mapped[float | None] = mapped_column(Float, nullable=True, default=None)
+    max_in: Mapped[float | None] = mapped_column(Float, nullable=True, default=None)