feat: Phase 0c - recovery_metrics.py module complete

Data Layer:
- get_sleep_duration_data() - avg duration with hours/minutes breakdown
- get_sleep_quality_data() - Deep+REM percentage with phase breakdown
- get_rest_days_data() - total count + breakdown by rest type

Placeholder Layer:
- get_sleep_avg_duration() - refactored to use data layer
- get_sleep_avg_quality() - refactored to use data layer
- get_rest_days_count() - refactored to use data layer

All 3 recovery data functions + 3 placeholder refactors complete.

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

backend/data_layer/__init__.py

@@ -32,9 +32,9 @@ from .utils import *
 from .body_metrics import *
 from .nutrition_metrics import *
 from .activity_metrics import *
+from .recovery_metrics import *
 
 # Future imports (will be added as modules are created):
-# from .recovery_metrics import *
 # from .health_metrics import *
 # from .goals import *
 # from .correlations import *
@@ -61,4 +61,9 @@ __all__ = [
     'get_activity_summary_data',
     'get_activity_detail_data',
     'get_training_type_distribution_data',
+
+    # Recovery Metrics
+    'get_sleep_duration_data',
+    'get_sleep_quality_data',
+    'get_rest_days_data',
 ]

backend/data_layer/recovery_metrics.py

@@ -0,0 +1,287 @@
+"""
+Recovery Metrics Data Layer
+
+Provides structured data for recovery tracking and analysis.
+
+Functions:
+    - get_sleep_duration_data(): Average sleep duration
+    - get_sleep_quality_data(): Sleep quality score (Deep+REM %)
+    - get_rest_days_data(): Rest day count and types
+
+All functions return structured data (dict) without formatting.
+Use placeholder_resolver.py for formatted strings for AI.
+
+Phase 0c: Multi-Layer Architecture
+Version: 1.0
+"""
+
+from typing import Dict, List, Optional
+from datetime import datetime, timedelta, date
+from db import get_db, get_cursor, r2d
+from data_layer.utils import calculate_confidence, safe_float, safe_int
+
+
+def get_sleep_duration_data(
+    profile_id: str,
+    days: int = 7
+) -> Dict:
+    """
+    Calculate average sleep duration.
+
+    Args:
+        profile_id: User profile ID
+        days: Analysis window (default 7)
+
+    Returns:
+        {
+            "avg_duration_hours": float,
+            "avg_duration_minutes": int,
+            "total_nights": int,
+            "nights_with_data": int,
+            "confidence": str,
+            "days_analyzed": int
+        }
+
+    Migration from Phase 0b:
+        OLD: get_sleep_avg_duration(pid, days) formatted string
+        NEW: Structured data with hours and minutes
+    """
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
+
+        cur.execute(
+            """SELECT sleep_segments FROM sleep_log
+               WHERE profile_id=%s AND date >= %s
+               ORDER BY date DESC""",
+            (profile_id, cutoff)
+        )
+        rows = cur.fetchall()
+
+        if not rows:
+            return {
+                "avg_duration_hours": 0.0,
+                "avg_duration_minutes": 0,
+                "total_nights": 0,
+                "nights_with_data": 0,
+                "confidence": "insufficient",
+                "days_analyzed": days
+            }
+
+        total_minutes = 0
+        nights_with_data = 0
+
+        for row in rows:
+            segments = row['sleep_segments']
+            if segments:
+                night_minutes = sum(seg.get('duration_min', 0) for seg in segments)
+                if night_minutes > 0:
+                    total_minutes += night_minutes
+                    nights_with_data += 1
+
+        if nights_with_data == 0:
+            return {
+                "avg_duration_hours": 0.0,
+                "avg_duration_minutes": 0,
+                "total_nights": len(rows),
+                "nights_with_data": 0,
+                "confidence": "insufficient",
+                "days_analyzed": days
+            }
+
+        avg_minutes = int(total_minutes / nights_with_data)
+        avg_hours = avg_minutes / 60
+
+        confidence = calculate_confidence(nights_with_data, days, "general")
+
+        return {
+            "avg_duration_hours": round(avg_hours, 1),
+            "avg_duration_minutes": avg_minutes,
+            "total_nights": len(rows),
+            "nights_with_data": nights_with_data,
+            "confidence": confidence,
+            "days_analyzed": days
+        }
+
+
+def get_sleep_quality_data(
+    profile_id: str,
+    days: int = 7
+) -> Dict:
+    """
+    Calculate sleep quality score (Deep+REM percentage).
+
+    Args:
+        profile_id: User profile ID
+        days: Analysis window (default 7)
+
+    Returns:
+        {
+            "quality_score": float,          # 0-100, Deep+REM percentage
+            "avg_deep_rem_minutes": int,
+            "avg_total_minutes": int,
+            "avg_light_minutes": int,
+            "avg_awake_minutes": int,
+            "nights_analyzed": int,
+            "confidence": str,
+            "days_analyzed": int
+        }
+
+    Migration from Phase 0b:
+        OLD: get_sleep_avg_quality(pid, days) formatted string
+        NEW: Complete sleep phase breakdown
+    """
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
+
+        cur.execute(
+            """SELECT sleep_segments FROM sleep_log
+               WHERE profile_id=%s AND date >= %s
+               ORDER BY date DESC""",
+            (profile_id, cutoff)
+        )
+        rows = cur.fetchall()
+
+        if not rows:
+            return {
+                "quality_score": 0.0,
+                "avg_deep_rem_minutes": 0,
+                "avg_total_minutes": 0,
+                "avg_light_minutes": 0,
+                "avg_awake_minutes": 0,
+                "nights_analyzed": 0,
+                "confidence": "insufficient",
+                "days_analyzed": days
+            }
+
+        total_quality = 0
+        total_deep_rem = 0
+        total_light = 0
+        total_awake = 0
+        total_all = 0
+        count = 0
+
+        for row in rows:
+            segments = row['sleep_segments']
+            if segments:
+                # Note: segments use 'phase' key, stored lowercase (deep, rem, light, awake)
+                deep_rem_min = sum(s.get('duration_min', 0) for s in segments if s.get('phase') in ['deep', 'rem'])
+                light_min = sum(s.get('duration_min', 0) for s in segments if s.get('phase') == 'light')
+                awake_min = sum(s.get('duration_min', 0) for s in segments if s.get('phase') == 'awake')
+                total_min = sum(s.get('duration_min', 0) for s in segments)
+
+                if total_min > 0:
+                    quality_pct = (deep_rem_min / total_min) * 100
+                    total_quality += quality_pct
+                    total_deep_rem += deep_rem_min
+                    total_light += light_min
+                    total_awake += awake_min
+                    total_all += total_min
+                    count += 1
+
+        if count == 0:
+            return {
+                "quality_score": 0.0,
+                "avg_deep_rem_minutes": 0,
+                "avg_total_minutes": 0,
+                "avg_light_minutes": 0,
+                "avg_awake_minutes": 0,
+                "nights_analyzed": 0,
+                "confidence": "insufficient",
+                "days_analyzed": days
+            }
+
+        avg_quality = total_quality / count
+        avg_deep_rem = int(total_deep_rem / count)
+        avg_total = int(total_all / count)
+        avg_light = int(total_light / count)
+        avg_awake = int(total_awake / count)
+
+        confidence = calculate_confidence(count, days, "general")
+
+        return {
+            "quality_score": round(avg_quality, 1),
+            "avg_deep_rem_minutes": avg_deep_rem,
+            "avg_total_minutes": avg_total,
+            "avg_light_minutes": avg_light,
+            "avg_awake_minutes": avg_awake,
+            "nights_analyzed": count,
+            "confidence": confidence,
+            "days_analyzed": days
+        }
+
+
+def get_rest_days_data(
+    profile_id: str,
+    days: int = 30
+) -> Dict:
+    """
+    Get rest days count and breakdown by type.
+
+    Args:
+        profile_id: User profile ID
+        days: Analysis window (default 30)
+
+    Returns:
+        {
+            "total_rest_days": int,
+            "rest_types": {
+                "strength": int,
+                "cardio": int,
+                "relaxation": int
+            },
+            "rest_frequency": float,  # days per week
+            "confidence": str,
+            "days_analyzed": int
+        }
+
+    Migration from Phase 0b:
+        OLD: get_rest_days_count(pid, days) formatted string
+        NEW: Complete breakdown by rest type
+    """
+    with get_db() as conn:
+        cur = get_cursor(conn)
+        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
+
+        # Get total distinct rest days
+        cur.execute(
+            """SELECT COUNT(DISTINCT date) as count FROM rest_days
+               WHERE profile_id=%s AND date >= %s""",
+            (profile_id, cutoff)
+        )
+        total_row = cur.fetchone()
+        total_count = total_row['count'] if total_row else 0
+
+        # Get breakdown by rest type
+        cur.execute(
+            """SELECT rest_type, COUNT(*) as count FROM rest_days
+               WHERE profile_id=%s AND date >= %s
+               GROUP BY rest_type""",
+            (profile_id, cutoff)
+        )
+        type_rows = cur.fetchall()
+
+        rest_types = {
+            "strength": 0,
+            "cardio": 0,
+            "relaxation": 0
+        }
+
+        for row in type_rows:
+            rest_type = row['rest_type']
+            if rest_type in rest_types:
+                rest_types[rest_type] = row['count']
+
+        # Calculate frequency (rest days per week)
+        rest_frequency = (total_count / days * 7) if days > 0 else 0.0
+
+        confidence = calculate_confidence(total_count, days, "general")
+
+        return {
+            "total_rest_days": total_count,
+            "rest_types": rest_types,
+            "rest_frequency": round(rest_frequency, 1),
+            "confidence": confidence,
+            "days_analyzed": days
+        }

backend/placeholder_resolver.py

@@ -28,6 +28,11 @@ from data_layer.activity_metrics import (
     get_activity_detail_data,
     get_training_type_distribution_data
 )
+from data_layer.recovery_metrics import (
+    get_sleep_duration_data,
+    get_sleep_quality_data,
+    get_rest_days_data
+)
 
 
 # ── Helper Functions ──────────────────────────────────────────────────────────
@@ -305,85 +310,44 @@ def get_trainingstyp_verteilung(profile_id: str, days: int = 14) -> str:
 
 
 def get_sleep_avg_duration(profile_id: str, days: int = 7) -> str:
-    """Calculate average sleep duration in hours."""
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-        cur.execute(
-            """SELECT sleep_segments FROM sleep_log
-               WHERE profile_id=%s AND date >= %s
-               ORDER BY date DESC""",
-            (profile_id, cutoff)
-        )
-        rows = cur.fetchall()
+    """
+    Calculate average sleep duration in hours.
 
-        if not rows:
+    Phase 0c: Refactored to use data_layer.recovery_metrics.get_sleep_duration_data()
+    This function now only FORMATS the data for AI consumption.
+    """
+    data = get_sleep_duration_data(profile_id, days)
+
+    if data['confidence'] == 'insufficient':
         return "nicht verfügbar"
 
-        total_minutes = 0
-        for row in rows:
-            segments = row['sleep_segments']
-            if segments:
-                # Sum duration_min from all segments
-                for seg in segments:
-                    total_minutes += seg.get('duration_min', 0)
-
-        if total_minutes == 0:
-            return "nicht verfügbar"
-
-        avg_hours = total_minutes / len(rows) / 60
-        return f"{avg_hours:.1f}h"
+    return f"{data['avg_duration_hours']:.1f}h"
 
 
 def get_sleep_avg_quality(profile_id: str, days: int = 7) -> str:
-    """Calculate average sleep quality (Deep+REM %)."""
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-        cur.execute(
-            """SELECT sleep_segments FROM sleep_log
-               WHERE profile_id=%s AND date >= %s
-               ORDER BY date DESC""",
-            (profile_id, cutoff)
-        )
-        rows = cur.fetchall()
+    """
+    Calculate average sleep quality (Deep+REM %).
 
-        if not rows:
+    Phase 0c: Refactored to use data_layer.recovery_metrics.get_sleep_quality_data()
+    This function now only FORMATS the data for AI consumption.
+    """
+    data = get_sleep_quality_data(profile_id, days)
+
+    if data['confidence'] == 'insufficient':
         return "nicht verfügbar"
 
-        total_quality = 0
-        count = 0
-        for row in rows:
-            segments = row['sleep_segments']
-            if segments:
-                # Note: segments use 'phase' key (not 'stage'), stored lowercase (deep, rem, light, awake)
-                deep_rem_min = sum(s.get('duration_min', 0) for s in segments if s.get('phase') in ['deep', 'rem'])
-                total_min = sum(s.get('duration_min', 0) for s in segments)
-                if total_min > 0:
-                    quality_pct = (deep_rem_min / total_min) * 100
-                    total_quality += quality_pct
-                    count += 1
-
-        if count == 0:
-            return "nicht verfügbar"
-
-        avg_quality = total_quality / count
-        return f"{avg_quality:.0f}% (Deep+REM)"
+    return f"{data['quality_score']:.0f}% (Deep+REM)"
 
 
 def get_rest_days_count(profile_id: str, days: int = 30) -> str:
-    """Count rest days in the given period."""
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cutoff = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
-        cur.execute(
-            """SELECT COUNT(DISTINCT date) as count FROM rest_days
-               WHERE profile_id=%s AND date >= %s""",
-            (profile_id, cutoff)
-        )
-        row = cur.fetchone()
-        count = row['count'] if row else 0
-        return f"{count} Ruhetage"
+    """
+    Count rest days in the given period.
+
+    Phase 0c: Refactored to use data_layer.recovery_metrics.get_rest_days_data()
+    This function now only FORMATS the data for AI consumption.
+    """
+    data = get_rest_days_data(profile_id, days)
+    return f"{data['total_rest_days']} Ruhetage"
 
 
 def get_vitals_avg_hr(profile_id: str, days: int = 7) -> str: