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Add multitenancy module: Hibernate 7 @TenantId vs schema-per-tenant (shared pool + search_path, pool per tenant), JWT tenant filter, isolation failure modes on PostgreSQL 17 (Hibernate 7.4.14.Final, Spring Boot 4.1.2)

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b4VQVEJWetTT1dYzyJ
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asmhatre
2026-10-29 05:52:26 +00:00
co-authored by Claude Sonnet 5.5
parent ef2d2aa8ea
commit 98f4ed7411
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multitenancy/output/04-search-path-leak.txt
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# a provider that does not reset search_path on release (tenancy.mode=leaky), pool size 1
== Hibernate finished a request as acme and gave the connection back; now an unrelated component borrows it
-- direct DataSource connection, tenant context empty
show search_path -> acme
select count(*) from invoice -> 1 (acme's data, read with no tenant at all)
== the same experiment with the correct provider (resetOnRelease=true), pool size 1, provider called the way Hibernate calls it
-- after getConnection("acme") + releaseConnection("acme", ..): show search_path -> "$user", public
-- select count(*) from invoice -> java.lang.IllegalStateException: org.postgresql.util.PSQLException: ERROR: relation "invoice" does not exist <- caused by org.postgresql.util.PSQLException: ERROR: relation "invoice" does not exist