> ## Documentation Index
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# services
# `prefect.settings.models.server.services`
## Classes
### `ServicesBaseSetting`
**Methods:**
#### `settings_customise_sources`
```python theme={null}
settings_customise_sources(cls, settings_cls: type[BaseSettings], init_settings: PydanticBaseSettingsSource, env_settings: PydanticBaseSettingsSource, dotenv_settings: PydanticBaseSettingsSource, file_secret_settings: PydanticBaseSettingsSource) -> tuple[PydanticBaseSettingsSource, ...]
```
Define an order for Prefect settings sources.
The order of the returned callables decides the priority of inputs; first item is the highest priority.
See [https://docs.pydantic.dev/latest/concepts/pydantic\_settings/#customise-settings-sources](https://docs.pydantic.dev/latest/concepts/pydantic_settings/#customise-settings-sources)
#### `to_environment_variables`
```python theme={null}
to_environment_variables(self, exclude_unset: bool = False, include_secrets: bool = True, include_aliases: bool = False) -> dict[str, str]
```
Convert the settings object to a dictionary of environment variables.
### `ServerServicesCancellationCleanupSettings`
Settings for controlling the cancellation cleanup service
### `ServerServicesDBVacuumSettings`
Settings for controlling the database vacuum service
**Methods:**
#### `enabled_vacuum_types`
```python theme={null}
enabled_vacuum_types(self) -> set[str]
```
Resolve `enabled` to a concrete set of vacuum type strings.
Handles legacy boolean values:
* `True` → `{"events", "flow_runs"}`
* `False` → `{"events"}` (preserves old default)
* `None` → `set()`
### `ServerServicesEventPersisterSettings`
Settings for controlling the event persister service
### `ServerServicesEventLoggerSettings`
Settings for controlling the event logger service
### `ServerServicesForemanSettings`
Settings for controlling the foreman service
### `ServerServicesLateRunsSettings`
Settings for controlling the late runs service
### `ServerServicesSchedulerSettings`
Settings for controlling the scheduler service
### `ServerServicesPauseExpirationsSettings`
Settings for controlling the pause expiration service
### `ServerServicesRepossessorSettings`
Settings for controlling the repossessor service
### `ServerServicesTaskRunRecorderSettings`
Settings for controlling the task run recorder service
### `ServerServicesTriggersSettings`
Settings for controlling the triggers service
### `ServerServicesSettings`
Settings for controlling server services
**Methods:**
#### `settings_customise_sources`
```python theme={null}
settings_customise_sources(cls, settings_cls: type[BaseSettings], init_settings: PydanticBaseSettingsSource, env_settings: PydanticBaseSettingsSource, dotenv_settings: PydanticBaseSettingsSource, file_secret_settings: PydanticBaseSettingsSource) -> tuple[PydanticBaseSettingsSource, ...]
```
Define an order for Prefect settings sources.
The order of the returned callables decides the priority of inputs; first item is the highest priority.
See [https://docs.pydantic.dev/latest/concepts/pydantic\_settings/#customise-settings-sources](https://docs.pydantic.dev/latest/concepts/pydantic_settings/#customise-settings-sources)
#### `to_environment_variables`
```python theme={null}
to_environment_variables(self, exclude_unset: bool = False, include_secrets: bool = True, include_aliases: bool = False) -> dict[str, str]
```
Convert the settings object to a dictionary of environment variables.
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