refactor: Improve person creation and identification logic with optional fields handling

This commit refactors the person creation and identification logic to handle optional fields more effectively. The `date_of_birth` field in the `PersonCreateRequest` schema is now optional, and the frontend has been updated to trim whitespace from name fields before submission. Additionally, the identification logic has been enhanced to ensure that only non-empty names are considered valid. Documentation has been updated to reflect these changes.

scripts/drop_all_tables_web.py

@@ -11,17 +11,39 @@ from sqlalchemy import inspect
 from src.web.db.session import engine, get_database_url
 from src.web.db.models import Base
 
+# Ordered list ensures foreign-key dependents drop first
+TARGET_TABLES = [
+    "photo_favorites",
+    "phototaglinkage",
+    "person_encodings",
+    "faces",
+    "tags",
+    "photos",
+    "people",
+]
+
 
 def drop_all_tables():
     """Drop all tables from the database."""
     db_url = get_database_url()
     print(f"Connecting to database: {db_url}")
     
-    # Drop all tables
-    print("\nDropping all tables...")
-    Base.metadata.drop_all(bind=engine)
+    inspector = inspect(engine)
+    existing_tables = set(inspector.get_table_names())
     
-    print("✅ All tables dropped successfully!")
+    print("\nDropping selected tables...")
+    for table_name in TARGET_TABLES:
+        if table_name not in Base.metadata.tables:
+            print(f"  ⚠️  Table '{table_name}' not found in metadata, skipping.")
+            continue
+        if table_name not in existing_tables:
+            print(f"  ℹ️  Table '{table_name}' does not exist in database, skipping.")
+            continue
+        table = Base.metadata.tables[table_name]
+        print(f"  🗑️  Dropping '{table_name}'...")
+        table.drop(bind=engine, checkfirst=True)
+    
+    print("✅ Selected tables dropped successfully!")
     print("\nYou can now recreate tables using:")
     print("  python scripts/recreate_tables_web.py")