Environment variables

Variable	Description	Used by
OPENAI_API_KEY	OpenAI API key	OpenAIGateway, ConfigurableEmbeddings
MISTRAL_API_KEY	Mistral API key	MistralGateway
COHERE_API_KEY	Cohere API key	ConfigurableEmbeddings
HUGGINGFACE_TOKEN	HuggingFace token	ConfigurableEmbeddings (private models)
POSTGRES_HOST	PostgreSQL host	DatabaseConfig, PostgresChatHistory
POSTGRES_PORT	PostgreSQL port	DatabaseConfig, PostgresChatHistory
POSTGRES_DB	PostgreSQL database	DatabaseConfig, PostgresChatHistory
POSTGRES_USER	PostgreSQL user	DatabaseConfig, PostgresChatHistory
POSTGRES_PASSWORD	PostgreSQL password	DatabaseConfig, PostgresChatHistory