Issue 2751 2756 prevent concurrent schema updates and support whole_system_schema healthcheck#2880

Merged

punktilious merged 9 commits intomainfrom issue-2751

Oct 21, 2021

+1,731-111

Commits on Oct 20, 2021

issue-2751 prevent concurrent schema updates and 2756 whole schema version tracking
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issue-2756 added schema version check to healthcheck
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issue-2751 add schema_versions check constraint to enforce single row
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Commits on Oct 21, 2021

issue-2751 renamed SCHEMA_VERSIONS to WHOLE_SCHEMA_VERSION and added select privilege for Db2 and PostgreSQL fhirserver user
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issue-2751 fixed copyright in some files
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issue-2751 updated method name and version check logic per review
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Merge remote-tracking branch 'origin/HEAD' into issue-2751
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issue-2757 log schema version discrepancy per review comments
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issue-2751 use new ThreadHandler to replace ThreadHelper
punktilious
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