Add test script for JSON extraction functionality

This commit introduces a new test script, `test_json_extraction.py`, which verifies the correctness of the JSON extraction logic. The script includes a function to extract the first valid JSON object from raw input and a series of test cases covering various scenarios, such as clean JSON, JSON with extra text, nested JSON, and escaped quotes. The tests ensure that the extraction function behaves as expected and handles edge cases appropriately.

app/main.py

@@ -30,7 +30,8 @@ from services.document_processor import DocumentProcessor
 from services.matching_engine import MatchingEngine
 from sqlalchemy.orm import Session
 
-create_db_tables()
+# Don't create tables at import time - do it on startup
+# create_db_tables()
 
 logging.basicConfig(
     level=logging.INFO,
@@ -54,6 +55,15 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
+
+@app.on_event("startup")
+async def startup_event():
+    """Initialize database on startup"""
+    logger.info("Starting up application...")
+    create_db_tables()
+    logger.info("Application startup complete")
+
+
 # Initialize DS Engine components
 matching_engine = MatchingEngine()
 document_processor = DocumentProcessor()
@@ -384,6 +394,7 @@ async def process_document(
     - ai_rules: Custom categorization rules to override default logic
       (e.g., [{"condition": "vendor is Starbucks", "action": "Food"}])
     """
+    logger.info(f"Request: {request}")
     try:
         # Get file info from database
         db_uploaded_file = get_uploaded_file_from_db(db, file_id)