Initial commit

This is a FastAPI backend microservice template used with `copier` utility.

Features of applied template are:
- Configuration file processing logic
- Metrics and tracing (both optional) configuration available
- Debug endpoints
- Database migration commands, prepared Alembic environment
- Database usage example in ping_db endpoint
- gitea sanity check pipeline

{{project_slug}}/db/config.py.jinja

@@ -0,0 +1,43 @@
+"""Database configuration class is defined here."""
+
+from dataclasses import dataclass
+from typing import Any
+
+from {{project_slug}}.utils.secrets import SecretStr
+
+
+@dataclass
+class DBConfig:
+    host: str
+    port: int
+    database: str
+    user: str
+    password: SecretStr
+    pool_size: int
+
+    def __post_init__(self):
+        self.password = SecretStr(self.password)
+
+
+@dataclass
+class MultipleDBsConfig:
+    master: DBConfig
+    replicas: list[DBConfig] | None = None
+
+    def __post_init__(self):
+        _dict_to_dataclass(self, "master", DBConfig)
+        if self.replicas is not None:
+            _list_dict_to_dataclasses(self, "replicas", DBConfig)
+
+
+def _list_dict_to_dataclasses(config_entry: Any, field_name: str, need_type: type) -> None:
+    list_dict = getattr(config_entry, field_name)
+    for i in range(len(list_dict)):  # pylint: disable=consider-using-enumerate
+        if isinstance(list_dict[i], dict):
+            list_dict[i] = need_type(**list_dict[i])
+
+
+def _dict_to_dataclass(config_entry: Any, field_name: str, need_type: type) -> None:
+    value = getattr(config_entry, field_name)
+    if isinstance(value, dict):
+        setattr(config_entry, field_name, need_type(**value))