feat: Backend complete with IMAP, PDF processing, Alembic migrations

- FastAPI Backend mit Router (emails, invoices, auth)
- PostgreSQL DB Models (Invoice, EmailLog, InvoiceDetail, User)
- PyMuPDF PDF-Verarbeitung mit Steuer-Erkennung
- openpyxl Excel-Export
- Alembic Migration initialisiert
- IMAP-Verbindung zu Strato funktioniert
- Docker-Setup mit Traefik-Labels

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

Daily Notes/072426.md

@@ -0,0 +1,15 @@
+# 072426 - Daily Work Log
+
+## Decisions
+-
+
+## Meetings & Conversations
+-
+
+## Notes
+- Session gestartet, AI Lab Verbindung getestet: online
+- Memory geladen: Phase 2 Architektur in Bearbeitung
+- Task Board geprüft: Backlog mit 15 Tickets, 8 erledigt, 6 offen
+
+## End of Day Summary
+-

Dockerfile.backend

@@ -16,6 +16,8 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy application code
 COPY backend/ ./backend/
 COPY .env.example .env
+COPY alembic.ini .
+COPY backend/alembic ./backend/alembic
 
 # Environment
 ENV PYTHONUNBUFFERED=1

alembic.ini

@@ -0,0 +1,116 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = backend/alembic
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file
+# for all available tokens
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python>=3.9 or backports.zoneinfo library.
+# Any required deps can installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to ZoneInfo()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; This defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "version_path_separator" below.
+# version_locations = %(here)s/bar:%(here)s/bat:migrations/versions
+
+# version path separator; As mentioned above, this is the character used to split
+# version_locations. The default within new alembic.ini files is "os", which uses os.pathsep.
+# If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os  # Use os.pathsep. Default configuration used for new projects.
+
+# set to 'true' to search source files recursively
+# in each "version_locations" directory
+# new in Alembic version 1.10
+# recursive_version_locations = false
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+sqlalchemy.url = driver://user:pass@localhost/dbname
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# lint with attempts to fix using "ruff" - use the exec runner, execute a binary
+# hooks = ruff
+# ruff.type = exec
+# ruff.executable = %(here)s/.venv/bin/ruff
+# ruff.options = --fix REVISION_SCRIPT_FILENAME
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

backend/alembic/env.py

@@ -0,0 +1,123 @@
+"""Alembic Environment Configuration"""
+from logging.config import fileConfig
+
+from sqlalchemy import pool
+from sqlalchemy import create_engine
+
+from alembic import context
+
+# Import models directly (avoid env file issues)
+from sqlalchemy import Column, Integer, String, DateTime, Float, Boolean, Text, JSON
+from sqlalchemy.ext.declarative import declarative_base
+from datetime import datetime
+
+Base = declarative_base()
+
+# Import models manually
+class Invoice(Base):
+    __tablename__ = "invoices"
+    id = Column(Integer, primary_key=True)
+    email_id = Column(String, index=True)
+    email_subject = Column(String, nullable=True)
+    email_from = Column(String, nullable=True)
+    email_date = Column(DateTime, nullable=True)
+    invoice_number = Column(String, index=True, nullable=True)
+    invoice_date = Column(DateTime, nullable=True)
+    invoice_amount = Column(Float, nullable=True)
+    invoice_tax_amount = Column(Float, nullable=True)
+    invoice_tax_rate = Column(Float, nullable=True)
+    invoice_tax_type = Column(String, nullable=True)
+    issuer_name = Column(String, nullable=True)
+    issuer_address = Column(Text, nullable=True)
+    file_path = Column(String, nullable=True)
+    file_name = Column(String, nullable=True)
+    storage_year = Column(Integer, nullable=True)
+    storage_path = Column(String, nullable=True)
+    processed = Column(Boolean, default=False)
+    processing_error = Column(Text, nullable=True)
+    confidence_score = Column(Float, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+class EmailLog(Base):
+    __tablename__ = "email_logs"
+    id = Column(Integer, primary_key=True)
+    email_id = Column(String, unique=True, index=True)
+    email_subject = Column(String, nullable=True)
+    email_from = Column(String, nullable=True)
+    email_date = Column(DateTime, nullable=True)
+    email_folder = Column(String, nullable=True)
+    matched_keywords = Column(JSON, nullable=True)
+    has_attachment = Column(Boolean, default=False)
+    attachment_type = Column(String, nullable=True)
+    processed = Column(Boolean, default=False)
+    processing_result = Column(String, nullable=True)
+    invoice_id = Column(Integer, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+class InvoiceDetail(Base):
+    __tablename__ = "invoice_details"
+    id = Column(Integer, primary_key=True)
+    invoice_id = Column(Integer, nullable=False, index=True)
+    raw_text = Column(Text, nullable=True)
+    parsed_data = Column(JSON, nullable=True)
+    confidence_breakdown = Column(JSON, nullable=True)
+    processing_notes = Column(Text, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+class User(Base):
+    __tablename__ = "users"
+    id = Column(Integer, primary_key=True)
+    username = Column(String, unique=True, index=True)
+    hashed_password = Column(String)
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+# Set target metadata for autogenerate
+target_metadata = Base.metadata
+
+# other values from the config
+def get_url():
+    """Get database URL from environment"""
+    import os
+    return os.getenv("DATABASE_URL", "postgresql+psycopg2://postgres:postgres@localhost:5432/invoice_check")
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode."""
+    url = get_url()
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        render_as_batch=True,
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode."""
+    url = get_url()
+
+    connectable = create_engine(
+        url,
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=True,
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

backend/alembic/script.py.mako

@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

backend/auth.py

@@ -10,11 +10,13 @@ from jose import JWTError, jwt
 from passlib.context import CryptContext
 from fastapi import Depends, HTTPException, status
 from fastapi.security import OAuth2PasswordBearer
-from sqlalchemy.orm import Session
+from sqlalchemy.orm import Session, declarative_base
 from sqlalchemy import Column, Integer, String, Boolean, DateTime
 
 from backend.database import get_db
 
+Base = declarative_base()
+
 # Konfiguration
 SECRET_KEY = os.getenv("SECRET_KEY", "your-secret-key-change-in-production")
 ALGORITHM = "HS256"

backend/main.py

@@ -7,6 +7,7 @@ from fastapi import FastAPI, Depends, HTTPException
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import JSONResponse
 from sqlalchemy.orm import Session
+from sqlalchemy import text
 
 from backend.database import get_db, engine, Base
 
@@ -39,7 +40,7 @@ app.add_middleware(
 async def health_check(db: Session = Depends(get_db)):
     """Health Check Endpoint"""
     try:
-        db.execute("SELECT 1")
+        db.execute(text("SELECT 1"))
         return {"status": "healthy", "database": "connected"}
     except Exception as e:
         return {"status": "unhealthy", "database": "disconnected", "error": str(e)}

backend/requirements.txt

@@ -19,7 +19,7 @@ pymupdf==1.24.10
 openpyxl==3.1.5
 
 # Mail (IMAP)
-imaplib2==3.5
+imaplib2==3.6
 
 # Allgemein
 python-dotenv==1.0.1

backend/routers/invoices.py

@@ -154,9 +154,11 @@ def extract_pdf_data(file_path: str) -> Dict[str, Any]:
     try:
         doc = fitz.open(file_path)
         text = ""
+        pages = 0
 
         for page in doc:
             text += page.get_text()
+            pages += 1
 
         doc.close()
 
@@ -166,7 +168,7 @@ def extract_pdf_data(file_path: str) -> Dict[str, Any]:
             "amount": extract_amount(text),
             "issuer": extract_issuer(text),
             "tax_info": detect_tax_type(text),
-            "pages": len(doc) if 'doc' in dir() else 0
+            "pages": pages
         }
 
     except Exception as e:

backend/tests/test_imap.py

@@ -0,0 +1,47 @@
+"""IMAP-Verbindungs-Test"""
+import imaplib
+import os
+import email
+
+IMAP_HOST = os.getenv("IMAP_HOST", "imap.strato.de")
+IMAP_PORT = int(os.getenv("IMAP_PORT", 993))
+IMAP_USER = os.getenv("IMAP_USER", "info@c-stone-dev.com")
+IMAP_PASSWORD = os.getenv("IMAP_PASSWORD", "hH22761,018!")
+
+print(f"Teste IMAP-Verbindung zu {IMAP_HOST}:{IMAP_PORT}")
+print(f"Benutzer: {IMAP_USER}")
+
+try:
+    mail = imaplib.IMAP4_SSL(IMAP_HOST, IMAP_PORT)
+    result, data = mail.login(IMAP_USER, IMAP_PASSWORD)
+    print(f"Login erfolgreich: {result}")
+
+    result, folders = mail.list()
+    print(f"Ordner:")
+    for folder in folders[:10]:  # Erste 10 Ordner
+        print(f"  {folder.decode()}")
+
+    # INBOX auswählen
+    result, data = mail.select("INBOX")
+    if result == "OK":
+        result, data = mail.search(None, 'ALL')
+        if result == "OK":
+            email_ids = data[0].split()
+            print(f"\nINBOX enthält {len(email_ids)} Emails")
+
+            # Letzte 5 Emails anzeigen
+            for email_id in email_ids[-5:]:
+                result, msg_data = mail.fetch(email_id, '(RFC822.HEADER)')
+                if result == "OK":
+                    msg = email.message_from_bytes(msg_data[0][1])
+                    subject = msg.get("Subject", "Kein Betreff")
+                    from_addr = msg.get("From", "Unbekannt")
+                    print(f"  Email {email_id.decode()}: {from_addr} - {subject}")
+
+    mail.logout()
+    print("\n✅ IMAP-Verbindung erfolgreich!")
+
+except imaplib.IMAP4.error as e:
+    print(f"❌ IMAP-Fehler: {e}")
+except Exception as e:
+    print(f"❌ Fehler: {e}")

backend/tests/test_pdf.py

@@ -0,0 +1,54 @@
+"""PDF-Verarbeitungs-Test"""
+import sys
+import os
+sys.path.insert(0, '/app')
+
+import fitz
+from backend.routers.invoices import extract_pdf_data, detect_tax_type, extract_amount, extract_invoice_number
+
+def test_pdf_extraction(file_path: str):
+    """Testet die Extraktion aus einer PDF-Datei"""
+    print(f"\n{'='*60}")
+    print(f"Teste: {file_path}")
+    print('='*60)
+
+    if not os.path.exists(file_path):
+        print(f"❌ Datei nicht gefunden: {file_path}")
+        return
+
+    # Extrahiere Daten
+    data = extract_pdf_data(file_path)
+
+    if "error" in data:
+        print(f"❌ Fehler: {data['error']}")
+        return
+
+    print(f"Seiten: {data.get('pages', 0)}")
+    print(f"Rechnungsnummer: {data.get('invoice_number') or 'Nicht gefunden'}")
+    print(f"Betrag: {data.get('amount')} €")
+    print(f"Austeller: {data.get('issuer') or 'Nicht gefunden'}")
+
+    tax_info = data.get('tax_info', {})
+    print(f"Steuerart: {tax_info.get('tax_type')}")
+    print(f"Steuersatz: {tax_info.get('tax_rate')}")
+    print(f"Confidence: {tax_info.get('confidence')}")
+
+    # Teste einzelne Funktionen
+    print(f"\n--- Einzelne Funktionen ---")
+    text = data.get('text', '')[:500]
+    print(f"Auszug aus Text:\n{text[:200]}...")
+
+    # Speichere extrahierten Text
+    with open(f'/tmp/test-invoices/{os.path.basename(file_path)}.txt', 'w') as f:
+        f.write(data.get('text', ''))
+    print(f"\nExtrahierter Text gespeichert in: /tmp/test-invoices/{os.path.basename(file_path)}.txt")
+
+if __name__ == '__main__':
+    # Teste lokale Dateien
+    test_files = [
+        '/tmp/test-invoices/rechnung_mit_mwst.pdf',
+        '/tmp/test-invoices/rechnung_ohne_mwst.pdf',
+    ]
+
+    for test_file in test_files:
+        test_pdf_extraction(test_file)