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There is no easy way to reactivate a deleted participant. It will take a lot of jugglery at the database end, firing SQLs, etc.

We do not recommend doing this and should be done at your risk.

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1. Participant registration details: 'catissue_coll_prot_reg' table
2. Participant details: 'catissue_participant' table
3. Participant MRN details: 'catissue_part_medical_id' table

Also, all the unique columns like MRN, SSN, etc are updated with a timestamp field so that later on a new patient with the same SSN or MRN can be added again. You will need to revert all this back to regain the old data again.

Follow the below-mentioned steps to reactivate participant: 

User Users should know the participant id or participant registration id to make changes in the database.

Run the following command to re-activate participant 

1. Update catissue_coll_prot_reg set activity_status = 'Active' where identifier = <participant registration id>
   
    OR
   
   Update catissue_coll_prot_reg set activity_status = 'Active' where participant_id = <participant id>
   
   
2. Select participant_id from catissue_coll_prot_reg where identifier = <participant registration id>;
   Update catissue_participant set  activity_status = 'Active' where identifier = <participant id from above query>
   
   OR
   
   Update catissue_participant set  activity_status = 'Active' where identifier = <participant id>

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