Initial commit: Shop Database Flask Application

Flask backend with Vue 3 frontend for shop floor machine management.
Includes database schema export for MySQL shopdb_flask database.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

shopdb/core/models/operatingsystem.py

@@ -0,0 +1,22 @@
+"""Operating System model."""
+
+from shopdb.extensions import db
+from .base import BaseModel
+
+
+class OperatingSystem(BaseModel):
+    """Operating system model."""
+    __tablename__ = 'operatingsystems'
+
+    osid = db.Column(db.Integer, primary_key=True)
+    osname = db.Column(db.String(100), nullable=False)
+    osversion = db.Column(db.String(50))
+    architecture = db.Column(db.String(20), comment='x86, x64, ARM')
+    endoflife = db.Column(db.Date, comment='End of support date')
+
+    __table_args__ = (
+        db.UniqueConstraint('osname', 'osversion', name='uq_os_name_version'),
+    )
+
+    def __repr__(self):
+        return f"<OperatingSystem {self.osname} {self.osversion}>"