| `SECRET` | A 32 character long secure random secret used for encrypting some data inside the database. When data has been created inside the database, the secret cannot be changed anymore, otherwise decryption fails. | Not set by default, you need to explicitly set it, e.g., generate via `openssl rand -hex 16` |
| `TZ` | The time zone (**recommended** to set it properly, background tasks depend on it) | Defaults to `Europe/Berlin`, can be any time zone according to _tz database_ |
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| `AUTH_MODE` | The auth mode. Possible values are `basic_single` and `basic_credentials` | Defaults to `basic_single` |
| `BASIC_AUTH_USER` | For auth mode `basic_single`: Username for login | Not set by default, you need to explicitly set it to user name |
| `BASIC_AUTH_PASSWORD` | For auth mode `basic_single`: User's password for login | Not set by default, you need to explicitly set it to a secure random |
| `BASIC_AUTH_CREDENTIALS` | For auth mode `basic_credentials`: list of comma separated credentials, e.g. `username1=password1,username2=password2` | Not set by default, you need to explicitly set it |
| `DB_MIGRATION_ENABLED` | See [database migration](#database-migration) for more detailed information. If `true` database migrations are executed; useful to disable when multiple instances are spawned | Defaults to `true`, possible values are `true` or `false` |
| `SERVER_LISTEN` | Server's listen address | Defaults to empty which equals `0.0.0.0` |
| `SERVER_TLS_ENABLED` | If server uses TLS | Defaults `false` |
| `SERVER_TLS_CERT_PATH` | When TLS enabled, provide the certificate path | |
| `SERVER_TLS_KEY_PATH` | When TLS enabled, provide the key path | |
| `SERVER_TIMEOUT` | Timeout the server waits before shutting down to end any pending tasks | Defaults to `1s` (1 second), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `CORS_ALLOW_ORIGINS` | CORS configuration | Defaults to `*` |
| `CORS_ALLOW_METHODS` | CORS configuration | Defaults to `GET, POST, PUT, PATCH, DELETE, OPTIONS` |
| `CORS_ALLOW_HEADERS` | CORS configuration | Defaults to `Authorization, Content-Type` |
| `CORS_ALLOW_CREDENTIALS` | CORS configuration | Defaults to `true` |
| `CORS_EXPOSE_HEADERS` | CORS configuration | Defaults to `*` |
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| `LOGGING_LEVEL` | Logging level. Possible are `debug`, `info`, `warn`, `error`, `dpanic`, `panic`, `fatal`. Setting to `debug` enables high verbosity output. | Defaults to `info` |
| `LOGGING_ENCODING` | Logging encoding. Possible are `console` and `json` | Defaults to `json` |
| `LOGGING_DIRECTORY` | Logging directory. When set, logs will be added to a file called `upda.log` in addition to the standard output. Ensure that upda has access permissions. Use an external program for log rotation if desired. | |
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| `WEBHOOKS_TOKEN_LENGTH` | The length of the token | Defaults to `16`, positive number |
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| `TASK_UPDATE_CLEAN_STALE_ENABLED` | If background task should run to do housekeeping of stale (ignored/approved) updates from the database | Defaults to `false` |
| `TASK_UPDATE_CLEAN_STALE_INTERVAL` | Interval at which a background task does housekeeping by deleting stale (ignored/approved) updates from the database | Defaults to `1h` (1 hour), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `TASK_UPDATE_CLEAN_STALE_MAX_AGE` | Number defining at which age stale (ignored/approved) updates are deleted by the background task (_updatedAt_ attribute decides) | Defaults to `720h` (168 hours = 1 week), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
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| `TASK_EVENT_CLEAN_STALE_ENABLED` | If background task should run to do housekeeping of stale (old) events from the database | Defaults to `false` |
| `TASK_EVENT_CLEAN_STALE_INTERVAL` | Interval at which a background task does housekeeping by deleting stale (old) events from the database | Defaults to `8h` (8 hours), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `TASK_EVENT_CLEAN_STALE_MAX_AGE` | Number defining at which age stale (old) events are deleted by the background task (_updatedAt_ attribute decides) | Defaults to `2190h` (2190 hours = 3 months), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
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| `TASK_ACTIONS_ENQUEUE_ENABLED` | If background task should run to enqueue matching actions derived from events (actions are invocation separately after being enqueued) | Defaults to `true` |
| `TASK_ACTIONS_ENQUEUE_INTERVAL` | Interval at which a background task does check to enqueue actions | Defaults to `10s` (10 seconds), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `TASK_ACTIONS_ENQUEUE_BATCH_SIZE` | Number defining how many unhandled events are processed in a batch by the background task | Defaults to `1`, must be positive number |
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| `TASK_ACTIONS_INVOKE_ENABLED` | If background task should run to invoke enqueued actions derived | Defaults to `true` |
| `TASK_ACTIONS_INVOKE_INTERVAL` | Interval at which a background task does check to invoke enqueued actions | Defaults to `10s` (10 seconds), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `TASK_ACTIONS_INVOKE_BATCH_SIZE` | Number defining how many enqueued actions are processed in a batch by the background task | Defaults to `1`, must be positive number |
| `TASK_ACTIONS_INVOKE_MAX_RETRIES` | Number defining how often actions are invoked in case of an error, if exceeded, those actions are not retried again | Defaults to `3`, must be positive number |
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| `TASK_ACTIONS_CLEAN_STALE_ENABLED` | If background task should run to do housekeeping of stale (handled, meaning success or error state) actions from the database | Defaults to `true` |
| `TASK_ACTIONS_CLEAN_STALE_INTERVAL` | Interval at which a background task does housekeeping by deleting stale (handled) actions from the database | Defaults to `12h` (12 hours), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
| `TASK_ACTIONS_CLEAN_STALE_MAX_AGE` | Number defining at which age stale (handled) actions are deleted by the background task (_updatedAt_ attribute decides) | Defaults to `720h` (720 hours = 30 days), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
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| `TASK_PROMETHEUS_REFRESH_INTERVAL` | Interval at which a background task updates custom metrics | Defaults to `60s` (60 seconds), qualifier can be `s = second`, `m = minute`, `h = hour` prefixed with a positive number |
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| `LOCK_REDIS_ENABLED` | If locking via REDIS (multiple instances) is enabled. Requires REDIS. Otherwise uses in-memory locks. | Defaults to `false` |
| `LOCK_REDIS_URL` | If locking via REDIS is enabled, this should point to a resolvable REDIS instance, e.g. `redis://<user>:<pass>@localhost:6379/<db>`. | |
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| `PROMETHEUS_ENABLED` | If Prometheus metrics are exposed | Defaults to `false` |
| `PROMETHEUS_METRICS_PATH` | Defines the metrics endpoint path | Defaults to `/metrics` |
| `PROMETHEUS_SECURE_TOKEN_ENABLED` | If Prometheus metrics endpoint is protected by a token when enabled (**recommended**) | Defaults to `true` |
| `PROMETHEUS_SECURE_TOKEN` | The token securing the metrics endpoint when enabled (**recommended**) | Not set by default, you need to explicitly set it to a secure random |
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| `WEB_API_URL` | Base URL of API, e.g. `https://upda.domain.tld` | `http://localhost` |
| `WEB_TITLE` | The title of the frontend page | `upda` |