Enhance API robustness: Add model validators, view-field filtering, and test suite.

- Added validators to Person_Base, Journal_Base, Journal_Entry_Base, Address_Base, and Contact_Base to handle null values and unsafe lookups.
- Implemented 'fields_to_exclude_from_db' ClassVar in Journal models to prevent view-only fields from causing DB errors.
- Updated Contact object map to align with DB schema.
- Added comprehensive test suite in 'tests/' directory (model validation, filtering logic).
- Updated GEMINI.md with progress.

app/models/address_models.py

@@ -3,7 +3,7 @@ import datetime, pytz
 from typing import Dict, List, Optional, Set, Union
 from pydantic import BaseModel, EmailStr, Field, Json, PrivateAttr, ValidationError, validator
 
-from app.db_sql import redis_lookup_id_random
+from app.db_sql import get_id_random, redis_lookup_id_random
 from app.lib_general import log, logging
 
 from app.models.common_field_schema import base_fields, default_num_bytes
@@ -123,7 +123,7 @@ class Address_Base(BaseModel):
         log.setLevel(logging.WARNING)
         log.debug(locals())
 
-        if values['for_id_random'] and values['for_type']:
+        if values.get('for_id_random') and values.get('for_type'):
             return redis_lookup_id_random(record_id_random=values['for_id_random'], table_name=values['for_type'])
         return None