Restructure: Move 43 files into 8 domain packages (backend-lehrer)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend-lehrer/recording_helpers.py

@@ -1,57 +1,4 @@
-"""
-Recording API - In-Memory Storage & Helpers.
-
-Shared state and utility functions for recording endpoints.
-"""
-
-import uuid
-from datetime import datetime
-from typing import Optional
-
-
-# ==========================================
-# IN-MEMORY STORAGE (Dev Mode)
-# ==========================================
-# In production, these would be database queries
-
-_recordings_store: dict = {}
-_transcriptions_store: dict = {}
-_audit_log: list = []
-_minutes_store: dict = {}
-
-
-def log_audit(
-    action: str,
-    recording_id: Optional[str] = None,
-    transcription_id: Optional[str] = None,
-    user_id: Optional[str] = None,
-    metadata: Optional[dict] = None
-):
-    """Log audit event for DSGVO compliance."""
-    _audit_log.append({
-        "id": str(uuid.uuid4()),
-        "recording_id": recording_id,
-        "transcription_id": transcription_id,
-        "user_id": user_id,
-        "action": action,
-        "metadata": metadata or {},
-        "created_at": datetime.utcnow().isoformat()
-    })
-
-
-def format_vtt_time(ms: int) -> str:
-    """Format milliseconds to VTT timestamp (HH:MM:SS.mmm)."""
-    hours = ms // 3600000
-    minutes = (ms % 3600000) // 60000
-    seconds = (ms % 60000) // 1000
-    millis = ms % 1000
-    return f"{hours:02d}:{minutes:02d}:{seconds:02d}.{millis:03d}"
-
-
-def format_srt_time(ms: int) -> str:
-    """Format milliseconds to SRT timestamp (HH:MM:SS,mmm)."""
-    hours = ms // 3600000
-    minutes = (ms % 3600000) // 60000
-    seconds = (ms % 60000) // 1000
-    millis = ms % 1000
-    return f"{hours:02d}:{minutes:02d}:{seconds:02d},{millis:03d}"
+# Backward-compat shim -- module moved to recording/helpers.py
+import importlib as _importlib
+import sys as _sys
+_sys.modules[__name__] = _importlib.import_module("recording.helpers")