Purge job update

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Original report by Luca Bruno (Bitbucket: lukkia, GitHub: lucabruno91).

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Update the job that purges images:

• delete everything older than 7 days
• delete also rows contained in notification_received table

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Original comment by Luca Bruno (Bitbucket: lukkia, GitHub: lucabruno91).

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Purge job settig update to 7 days ref #153

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Original comment by Luca Bruno (Bitbucket: lukkia, GitHub: lucabruno91).

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try catch added ref #153

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Original changes by Luca Bruno (Bitbucket: lukkia, GitHub: lucabruno91).

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• changed state from "new" to "resolved"