Protean

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* Fix Issue with timestamps in EventLog

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* Add support for locking a custom repository to a specific database
* Add support for `use_ssl` and `verify_certs` options in Elasticsearch database definition

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* Lock down celery to 4.4.x version
* Re-Add support for restricting model to a specific database

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* Introduce Views (a.k.a Read Models)
* Refactor Domain Module to be leaner
* Introduce Class Factories for all Domain Elements
* Rename `impl` to `adapters`
* Add separate `ports` module with interfaces
* Remove `bounded_context` definition everywhere
* Rename `dict_repo` to `memory`
* Remove `*_repo` from DB adapter module names
* Rename `celery` and `inline` broker module names
* Rename `sendgrid` email module name

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* Add support to restrict a model to a specific database
* Add support for optional pickling of `List` fields (leverage Postgres List support)
* Add support for Overlap operator in SQLAlchemy repo for Postgresql
* Bugfix - Return keys as Strings for `Dict` field
* Add support for storing Array of dictionaries in Postgres JSON column
* Bugfix - Validate unique constraints in Dictionary repo
* Bugfix - Fix broken Entity construction from Elasticsearch model

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* Allow Postgres Models to choose b/w Pickle or Custom Types for Array and JSON
* Add support for Any operator/lookup for Postgres