refactor: extract Pydantic models to models.py

Phase 1.3 - Data Models isolieren

NEUE DATEI:
- backend/models.py: Alle Pydantic Models (122 Zeilen)
  * ProfileCreate, ProfileUpdate
  * WeightEntry, CircumferenceEntry, CaliperEntry
  * ActivityEntry, NutritionDay
  * LoginRequest, PasswordResetRequest, PasswordResetConfirm
  * AdminProfileUpdate

ÄNDERUNGEN:
- backend/main.py:
  * Import models from models.py
  * Entfernt: ~60 Zeilen Model-Definitionen
  * Von 2025 → 1878 Zeilen (-147 Zeilen / -7%)

PROGRESS:
✅ db.py: Database + init_db
✅ auth.py: Auth functions + dependencies
✅ models.py: Pydantic schemas

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/main.py

@@ -17,6 +17,11 @@ from starlette.requests import Request
 
 from db import get_db, get_cursor, r2d, init_db
 from auth import hash_pin, verify_pin, make_token, get_session, require_auth, require_auth_flexible, require_admin
+from models import (
+    ProfileCreate, ProfileUpdate, WeightEntry, CircumferenceEntry,
+    CaliperEntry, ActivityEntry, NutritionDay, LoginRequest,
+    PasswordResetRequest, PasswordResetConfirm, AdminProfileUpdate
+)
 
 DATA_DIR   = Path(os.getenv("DATA_DIR",   "./data"))
 PHOTOS_DIR = Path(os.getenv("PHOTOS_DIR", "./photos"))
@@ -63,60 +68,10 @@ def get_pid(x_profile_id: Optional[str] = Header(default=None)) -> str:
     raise HTTPException(400, "Kein Profil gefunden")
 
 # ── Models ────────────────────────────────────────────────────────────────────
-class ProfileCreate(BaseModel):
-    name: str
-    avatar_color: Optional[str] = '#1D9E75'
-    sex: Optional[str] = 'm'
-    dob: Optional[str] = None
-    height: Optional[float] = 178
-    goal_weight: Optional[float] = None
-    goal_bf_pct: Optional[float] = None
-
-class ProfileUpdate(BaseModel):
-    name: Optional[str] = None
-    avatar_color: Optional[str] = None
-    sex: Optional[str] = None
-    dob: Optional[str] = None
-    height: Optional[float] = None
-    goal_weight: Optional[float] = None
-    goal_bf_pct: Optional[float] = None
-
-class WeightEntry(BaseModel):
-    date: str; weight: float; note: Optional[str]=None
-
-class CircumferenceEntry(BaseModel):
-    date: str
-    c_neck: Optional[float]=None; c_chest: Optional[float]=None
-    c_waist: Optional[float]=None; c_belly: Optional[float]=None
-    c_hip: Optional[float]=None; c_thigh: Optional[float]=None
-    c_calf: Optional[float]=None; c_arm: Optional[float]=None
-    notes: Optional[str]=None; photo_id: Optional[str]=None
-
-class CaliperEntry(BaseModel):
-    date: str; sf_method: Optional[str]='jackson3'
-    sf_chest: Optional[float]=None; sf_axilla: Optional[float]=None
-    sf_triceps: Optional[float]=None; sf_subscap: Optional[float]=None
-    sf_suprailiac: Optional[float]=None; sf_abdomen: Optional[float]=None
-    sf_thigh: Optional[float]=None; sf_calf_med: Optional[float]=None
-    sf_lowerback: Optional[float]=None; sf_biceps: Optional[float]=None
-    body_fat_pct: Optional[float]=None; lean_mass: Optional[float]=None
-    fat_mass: Optional[float]=None; notes: Optional[str]=None
-
-class ActivityEntry(BaseModel):
-    date: str; start_time: Optional[str]=None; end_time: Optional[str]=None
-    activity_type: str; duration_min: Optional[float]=None
-    kcal_active: Optional[float]=None; kcal_resting: Optional[float]=None
-    hr_avg: Optional[float]=None; hr_max: Optional[float]=None
-    distance_km: Optional[float]=None; rpe: Optional[int]=None
-    source: Optional[str]='manual'; notes: Optional[str]=None
-
-class NutritionDay(BaseModel):
-    date: str; kcal: Optional[float]=None; protein_g: Optional[float]=None
-    fat_g: Optional[float]=None; carbs_g: Optional[float]=None
-
 # ── Profiles ──────────────────────────────────────────────────────────────────
 from datetime import timedelta
 
+# Models moved to models.py
 # Auth functions moved to auth.py
 
 @app.get("/api/profiles")
@@ -1092,17 +1047,6 @@ def get_ai_usage(x_profile_id: Optional[str]=Header(default=None), session: dict
     }
 
 # ── Auth ──────────────────────────────────────────────────────────────────────
-class LoginRequest(BaseModel):
-    email: str
-    password: str
-
-class PasswordResetRequest(BaseModel):
-    email: str
-
-class PasswordResetConfirm(BaseModel):
-    token: str
-    new_password: str
-
 @app.post("/api/auth/login")
 @limiter.limit("5/minute")
 async def login(req: LoginRequest, request: Request):
@@ -1250,12 +1194,6 @@ def password_reset_confirm(req: PasswordResetConfirm):
     return {"ok": True, "message": "Passwort erfolgreich zurückgesetzt"}
 
 # ── Admin ─────────────────────────────────────────────────────────────────────
-class AdminProfileUpdate(BaseModel):
-    role: Optional[str] = None
-    ai_enabled: Optional[int] = None
-    ai_limit_day: Optional[int] = None
-    export_enabled: Optional[int] = None
-
 @app.get("/api/admin/profiles")
 def admin_list_profiles(session: dict=Depends(require_admin)):
     """Admin: List all profiles with stats."""

backend/models.py

@@ -0,0 +1,119 @@
+"""
+Pydantic Models for Mitai Jinkendo API
+
+Data validation schemas for request/response bodies.
+"""
+from typing import Optional
+from pydantic import BaseModel
+
+
+# ── Profile Models ────────────────────────────────────────────────────────────
+
+class ProfileCreate(BaseModel):
+    name: str
+    avatar_color: Optional[str] = '#1D9E75'
+    sex: Optional[str] = 'm'
+    dob: Optional[str] = None
+    height: Optional[float] = 178
+    goal_weight: Optional[float] = None
+    goal_bf_pct: Optional[float] = None
+
+
+class ProfileUpdate(BaseModel):
+    name: Optional[str] = None
+    avatar_color: Optional[str] = None
+    sex: Optional[str] = None
+    dob: Optional[str] = None
+    height: Optional[float] = None
+    goal_weight: Optional[float] = None
+    goal_bf_pct: Optional[float] = None
+
+
+# ── Tracking Models ───────────────────────────────────────────────────────────
+
+class WeightEntry(BaseModel):
+    date: str
+    weight: float
+    note: Optional[str] = None
+
+
+class CircumferenceEntry(BaseModel):
+    date: str
+    c_neck: Optional[float] = None
+    c_chest: Optional[float] = None
+    c_waist: Optional[float] = None
+    c_belly: Optional[float] = None
+    c_hip: Optional[float] = None
+    c_thigh: Optional[float] = None
+    c_calf: Optional[float] = None
+    c_arm: Optional[float] = None
+    notes: Optional[str] = None
+    photo_id: Optional[str] = None
+
+
+class CaliperEntry(BaseModel):
+    date: str
+    sf_method: Optional[str] = 'jackson3'
+    sf_chest: Optional[float] = None
+    sf_axilla: Optional[float] = None
+    sf_triceps: Optional[float] = None
+    sf_subscap: Optional[float] = None
+    sf_suprailiac: Optional[float] = None
+    sf_abdomen: Optional[float] = None
+    sf_thigh: Optional[float] = None
+    sf_calf_med: Optional[float] = None
+    sf_lowerback: Optional[float] = None
+    sf_biceps: Optional[float] = None
+    body_fat_pct: Optional[float] = None
+    lean_mass: Optional[float] = None
+    fat_mass: Optional[float] = None
+    notes: Optional[str] = None
+
+
+class ActivityEntry(BaseModel):
+    date: str
+    start_time: Optional[str] = None
+    end_time: Optional[str] = None
+    activity_type: str
+    duration_min: Optional[float] = None
+    kcal_active: Optional[float] = None
+    kcal_resting: Optional[float] = None
+    hr_avg: Optional[float] = None
+    hr_max: Optional[float] = None
+    distance_km: Optional[float] = None
+    rpe: Optional[int] = None
+    source: Optional[str] = 'manual'
+    notes: Optional[str] = None
+
+
+class NutritionDay(BaseModel):
+    date: str
+    kcal: Optional[float] = None
+    protein_g: Optional[float] = None
+    fat_g: Optional[float] = None
+    carbs_g: Optional[float] = None
+
+
+# ── Auth Models ───────────────────────────────────────────────────────────────
+
+class LoginRequest(BaseModel):
+    email: str
+    password: str
+
+
+class PasswordResetRequest(BaseModel):
+    email: str
+
+
+class PasswordResetConfirm(BaseModel):
+    token: str
+    new_password: str
+
+
+# ── Admin Models ──────────────────────────────────────────────────────────────
+
+class AdminProfileUpdate(BaseModel):
+    role: Optional[str] = None
+    ai_enabled: Optional[int] = None
+    ai_limit_day: Optional[int] = None
+    export_enabled: Optional[int] = None