Add a mode for initial ingestion of event data

## Background
When an event table is ingested initially, the history can be quite long.
Executing each event date one by one can have a big overhead and execute many queries against the source database.

## Feature
Add a mode for initial ingestion of event data.

## Example
TBD

## Proposed Solution
What we can do is load full table in one go to a temporary directory (cache), and then run pipeline tasks for each date found in the database.