# 20181113-01 **Summary:** Optimize check constraints for unique relationship/participations \ **Details:** The old unique constraint for entity relationships, act relationship, and act participations consumed at minimum 48 bytes per index entry, this patch converts these unique indexes to use SHA1 which only consumes 20 bytes per entry. This saves significant space in deployments where > 10 million rows exist in these tables. \ **Bug / Issues:** N/A\ **Applies To:** SanteDB Server , OpenIZ Server \ **Impacted Versions:** 1.1.0.0 - 1.9.0.0\ **Status:** Released (November 13, 2018)\ **Impact:** Low \ **RDBMS:** PostgreSQL --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://help.santesuite.org/knowledgebase/fixpatch/20181113-01.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.