Correction bug #18 - add a unique constraint - add the original tag to the list (to be able to diffeerentiate) - return 400 bad request when necessary - catch that in the js to display an error message

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CREATE DATABASE hdabo

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  WITH ENCODING='UTF8'

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       OWNER=iri

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       TEMPLATE=template0

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       LC_COLLATE='fr_FR.UTF-8'

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       LC_CTYPE='fr_FR.UTF-8'

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       CONNECTION LIMIT=-1;