fix _most_ of the type checker issues in config.py

The `PostgresDsn.build()` type checker issue is a head-scratcher

src/regtech_user_fi_management/config.py

@@ -1,17 +1,16 @@
 import os
+from pathlib import Path
 from urllib import parse
-from typing import Any
 
-from pydantic import field_validator, ValidationInfo
-from pydantic.networks import PostgresDsn
+from pydantic import field_validator, PostgresDsn, ValidationInfo
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 from regtech_api_commons.oauth2.config import KeycloakSettings
 
 
 JWT_OPTS_PREFIX = "jwt_opts_"
 
-env_files_to_load = [".env"]
+env_files_to_load: list[Path|str] = [".env"]
 if os.getenv("ENV", "LOCAL") == "LOCAL":
     env_files_to_load.append(".env.local")
 
@@ -23,22 +22,22 @@ class Settings(BaseSettings):
     inst_db_pwd: str
     inst_db_host: str
     inst_db_scheme: str = "postgresql+asyncpg"
-    inst_conn: PostgresDsn | None = None
+    inst_conn: str | None = None
 
     def __init__(self, **data):
         super().__init__(**data)
 
     @field_validator("inst_conn", mode="before")
     @classmethod
-    def build_postgres_dsn(cls, postgres_dsn, info: ValidationInfo) -> Any:
+    def build_postgres_dsn(cls, field_value, info: ValidationInfo) -> str:
         postgres_dsn = PostgresDsn.build(
             scheme=info.data.get("inst_db_scheme"),
             username=info.data.get("inst_db_user"),
-            password=parse.quote(info.data.get("inst_db_pwd"), safe=""),
+            password=parse.quote(str(info.data.get("inst_db_pwd")), safe=""),
             host=info.data.get("inst_db_host"),
             path=info.data.get("inst_db_name"),
         )
-        return str(postgres_dsn)
+        return postgres_dsn.unicode_string()
 
     model_config = SettingsConfigDict(env_file=env_files_to_load, extra="allow")
 

src/regtech_user_fi_management/entities/engine/engine.py

@@ -4,9 +4,9 @@
     async_scoped_session,
 )
 from asyncio import current_task
-from config import settings
+from regtech_user_fi_management.config import settings
 
-engine = create_async_engine(settings.inst_conn.unicode_string(), echo=True).execution_options(
+engine = create_async_engine(str(settings.inst_conn), echo=True).execution_options(
     schema_translate_map={None: settings.inst_db_schema}
 )
 SessionLocal = async_scoped_session(async_sessionmaker(engine, expire_on_commit=False), current_task)