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Update product_docs/docs/pgd/5/consistency/crdt.mdx
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Co-authored-by: Nick Babadzhanian <[email protected]>
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djw-m and pgnickb committed Apr 16, 2024
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Conflict-free replicated data types (CRDT) support merging values from concurrently modified rows instead of discarding one of the rows as traditional resolution does.

!!! Note Permissions Required
PGD CRDT require execute access to CRDT types, therefore a user must have at least the [bdr_application](security/pgd-predefined-roles/#bdr_application) role assigned to them.
PGD CRDT require usage access to CRDT types, therefore a user must have at least the [bdr_application](security/pgd-predefined-roles/#bdr_application) role assigned to them.
!!!

Each CRDT type is implemented as a separate PostgreSQL data type with an extra callback added to the `bdr.crdt_handlers` catalog. The merge process happens inside the PGD writer on the apply side without any user
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