refactor: redis url as computed config attr

app/config.py

@@ -11,15 +11,44 @@ class Settings(BaseSettings):
         env_ignore_empty=True,
         extra="ignore"
     )
-    redis_url: RedisDsn = os.getenv("REDIS_URL")
     jwt_algorithm: str = os.getenv("JWT_ALGORITHM")
     jwt_expire: int = os.getenv("JWT_EXPIRE")
 
+    REDIS_HOST: str
+    REDIS_PORT: int
+    REDIS_DB: str
+
+    JWT_ALGORITHM: str
+    JWT_EXPIRE: int
+
     SQL_USER: str
     SQL_PASS: str
     SQL_HOST: str
     SQL_DB: str
 
+    @computed_field
+    @property
+    def redis_url(self) -> RedisDsn:
+        """
+        This is a computed field that generates a RedisDsn URL for redis-py.
+
+        The URL is built using the MultiHostUrl.build method, which takes the following parameters:
+        - scheme: The scheme of the URL. In this case, it is "redis".
+        - host: The host of the Redis database, retrieved from the REDIS_HOST environment variable.
+        - port: The port of the Redis database, retrieved from the REDIS_PORT environment variable.
+        - path: The path of the Redis database, retrieved from the REDIS_DB environment variable.
+
+        Returns:
+            RedisDsn: The constructed RedisDsn URL for redis-py.
+        """
+        return MultiHostUrl.build(
+            scheme="redis",
+            host=self.REDIS_HOST,
+            port=self.REDIS_PORT,
+            path=self.REDIS_DB,
+
+        )
+
     @computed_field
     @property
     def asyncpg_url(self) -> PostgresDsn: