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Release 4.7.1

Bigquery integration (#30)

* Add BigQueryDB(DB) class, bigquery_cursor_context, query_command and copy_from_stdin_command for BQ (wip)

* Minor

* Add copy_command from PG to BQ

* improve bq load to use a GCS bucked during file upload

* fix PostgreSQL + add other DBs to BigQueryDB

* update readme

* Adjust default behaviour of copy_from_stdin_command. Update README

* Improve bigquery_cursor_context. Adjust README

* fix variable name

* Change version

Co-authored-by: Leonhard Schick <[email protected]>
Co-authored-by: Martin Loetzsch <[email protected]>

bug fix

Release 4.6.0

- Escape double quotes in copy_from_sdtin_command for PostgreSQL (#33)
- Add overview page to visualization

**required changes**

If you use quotes in tables names in `Copy` commands, check whether they still work.