Adding ISOThread and UNC Thread

app/schemas/unc_thread.py

@@ -0,0 +1,52 @@
+import re
+
+from pydantic import BaseModel, ConfigDict, Field, field_validator
+
+from app.models.unc_thread import UncSeries
+
+_FRACTION_RE = re.compile(r"^\d+(/\d+)?(-\d+/\d+)?$")
+
+
+class UncThreadBase(BaseModel):
+    diameter_fraction: str = Field(
+        ...,
+        description='Nominal diameter as a fractional inch string, e.g. "1/4", "3/8", "1-1/2"',
+    )
+    tpi: int = Field(..., gt=0, description="Threads per inch")
+    series: UncSeries
+    depth_in: float | None = Field(None, gt=0, description="Thread depth in inches")
+
+    @field_validator("diameter_fraction")
+    @classmethod
+    def validate_fraction(cls, v: str) -> str:
+        if not _FRACTION_RE.match(v):
+            raise ValueError(
+                'diameter_fraction must be a fractional inch string, e.g. "1/4", "3/8", "1-1/2"'
+            )
+        return v
+
+
+class UncThreadCreate(UncThreadBase):
+    pass
+
+
+class UncThreadUpdate(BaseModel):
+    diameter_fraction: str | None = None
+    tpi: int | None = Field(None, gt=0)
+    series: UncSeries | None = None
+    depth_in: float | None = Field(None, gt=0)
+
+    @field_validator("diameter_fraction")
+    @classmethod
+    def validate_fraction(cls, v: str | None) -> str | None:
+        if v is not None and not _FRACTION_RE.match(v):
+            raise ValueError(
+                'diameter_fraction must be a fractional inch string, e.g. "1/4", "3/8", "1-1/2"'
+            )
+        return v
+
+
+class UncThreadRead(UncThreadBase):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int