Create Relay Bot MVP

app/config.py

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+from pathlib import Path
+
+from pydantic import Field, SecretStr, field_validator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_file=".env", extra="ignore")
+
+    telegram_bot_token: SecretStr
+    deepseek_api_key: SecretStr
+    deepseek_base_url: str = "https://api.deepseek.com"
+    deepseek_model: str = "deepseek-chat"
+    database_url: str
+    repository_url: str = ""
+    repository_branch: str = "main"
+    repository_access_token: SecretStr | None = None
+    owner_telegram_id: int
+    project_group_id: int
+    bot_timezone: str = "Europe/Paris"
+    log_level: str = "INFO"
+    repository_path: Path = Path("data/repository")
+    max_repository_file_bytes: int = 250_000
+    max_attachment_bytes: int = 5_000_000
+    context_token_limit: int = 12_000
+    summary_trigger_tokens: int = 9_000
+    proactive_confidence_threshold: float = Field(default=0.86, ge=0, le=1)
+    proactive_cooldown_seconds: int = 120
+
+    @field_validator("repository_path", mode="before")
+    @classmethod
+    def expand_repository_path(cls, value: str | Path) -> Path:
+        return Path(value).resolve()
+
+    @property
+    def sync_database_url(self) -> str:
+        return self.database_url.replace("+asyncpg", "")