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# database
# `prefect.server.events.storage.database`
## Functions
### `build_distinct_queries`
```python theme={null}
build_distinct_queries(db: PrefectDBInterface, events_filter: EventFilter) -> list[sa.Column['ORMEvent']]
```
### `query_events`
```python theme={null}
query_events(session: AsyncSession, filter: EventFilter, page_size: int = INTERACTIVE_PAGE_SIZE) -> tuple[list[ReceivedEvent], int, Optional[str]]
```
### `query_next_page`
```python theme={null}
query_next_page(session: AsyncSession, page_token: str) -> tuple[list[ReceivedEvent], int, Optional[str]]
```
### `count_events`
```python theme={null}
count_events(session: AsyncSession, filter: EventFilter, countable: Countable, time_unit: TimeUnit, time_interval: float) -> list[EventCount]
```
### `raw_count_events`
```python theme={null}
raw_count_events(db: PrefectDBInterface, session: AsyncSession, events_filter: EventFilter) -> int
```
Count events from the database with the given filter.
Only returns the count and does not return any addition metadata. For additional
metadata, use `count_events`.
**Args:**
* `session`: a database session
* `events_filter`: filter criteria for events
**Returns:**
* The count of events in the database that match the filter criteria.
### `read_events`
```python theme={null}
read_events(db: PrefectDBInterface, session: AsyncSession, events_filter: EventFilter, limit: Optional[int] = None, offset: Optional[int] = None) -> Sequence['ORMEvent']
```
Read events from the Postgres database.
**Args:**
* `session`: a Postgres events session.
* `filter`: filter criteria for events.
* `limit`: limit for the query.
* `offset`: offset for the query.
**Returns:**
* A list of events ORM objects.
### `write_events`
```python theme={null}
write_events(session: AsyncSession, events: list[ReceivedEvent]) -> None
```
Write events to the database.
**Args:**
* `session`: a database session
* `events`: the events to insert
### `get_max_query_parameters`
```python theme={null}
get_max_query_parameters() -> int
```
### `get_number_of_event_fields`
```python theme={null}
get_number_of_event_fields() -> int
```
### `get_number_of_resource_fields`
```python theme={null}
get_number_of_resource_fields() -> int
```
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