Support many sources#3

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alvir wants to merge 8 commits intomasterfrom

support-many-sources

Commits on May 9, 2020

Add support more than one DB.
alvir
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Commits on May 21, 2020

Commits on Jun 4, 2020

Extract Hooks module.
alvir
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Add username processing of postgres connection settings
alvir
committed

Commits on Nov 21, 2021

Convert port settings to String.
alvir
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Bump version to 1.0.0.rc
alvir
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