This PR adds test coverage for keyspace notifications that affect modules like RediSearch, which use SetKeyMeta in notification callbacks.

Test Coverage Analysis

Legend

• ✅ = Already covered (before this PR)
• 🆕 = Added in this PR
• ❌ = Not covered

Hash Events (NOTIFY_HASH)

Event	Commands That Trigger	Coverage	Test Name
hset	HSET, HMSET, HSETNX	✅ Already covered	HSET with SetKeyMeta..., HMSET with SetKeyMeta..., HSETNX with SetKeyMeta...
hset	HSETEX	🆕 This PR	HSETEX with SetKeyMeta in notification does not crash
hdel	HDEL	🆕 This PR	HDEL with SetKeyMeta in notification does not crash
hdel	HGETDEL	🆕 This PR	HGETDEL with SetKeyMeta in notification does not crash
hdel	HGETEX/HSETEX/HEXPIRE (past timestamp)	🆕 This PR	Covered via HGETEX, HSETEX, HEXPIRE tests
hincrby	HINCRBY	✅ Already covered	HINCRBY with SetKeyMeta in notification does not crash
hincrbyfloat	HINCRBYFLOAT	✅ Already covered	HINCRBYFLOAT with SetKeyMeta in notification does not crash
hexpire	HEXPIRE, HPEXPIRE, HEXPIREAT, HPEXPIREAT	🆕 This PR	HEXPIRE with SetKeyMeta in notification does not crash
hexpire	HGETEX (with EX/PX), HSETEX (with EX/PX)	🆕 This PR	HGETEX with SetKeyMeta..., HSETEX with SetKeyMeta...
hpersist	HPERSIST	🆕 This PR	HPERSIST with SetKeyMeta in notification does not crash
hpersist	HGETEX (with PERSIST)	🆕 This PR	HGETEX with SetKeyMeta in notification does not crash (with setcount assertion)
hexpired	Lazy/Active field expiration	🆕 This PR	Hash field expiration (hexpired) with SetKeyMeta in notification does not crash

Generic Events (NOTIFY_GENERIC)

Event	Commands That Trigger	Coverage	Test Name
del	DEL, UNLINK	✅ Already covered	DEL with SetKeyMeta in notification does not crash
del	Hash becomes empty	🆕 This PR	Via HDEL with SetKeyMeta..., HGETDEL with SetKeyMeta... tests
rename_from	RENAME, RENAMENX	✅ Already covered	RENAME with SetKeyMeta in notification does not crash
rename_to	RENAME, RENAMENX	✅ Already covered	RENAME with SetKeyMeta in notification does not crash
restore	RESTORE	✅ Already covered	RESTORE with SetKeyMeta in notification does not crash
expire	EXPIRE, PEXPIRE, EXPIREAT, PEXPIREAT	✅ Already covered	EXPIRE and key expiry with SetKeyMeta in notification does not crash
persist	PERSIST	🆕 This PR	PERSIST with SetKeyMeta in notification does not crash
copy_to	COPY	🆕 This PR	COPY with SetKeyMeta in notification does not crash
loaded	RDB load (DEBUG RELOAD)	✅ Already covered	DEBUG RELOAD with SetKeyMeta in notification does not crash

New Tests Added

Test Name	Events Covered	Status Without Fix
HSETEX with SetKeyMeta in notification does not crash	hset, hexpire, hdel	❌ CRASHES
HGETDEL with SetKeyMeta in notification does not crash	hdel, hexpired	❌ CRASHES
HGETEX with SetKeyMeta in notification does not crash	hexpire, hpersist, hdel	❌ CRASHES
HDEL with SetKeyMeta in notification does not crash	hdel	❌ CRASHES
HEXPIRE with SetKeyMeta in notification does not crash	hexpire, hdel	❌ CRASHES
HPERSIST with SetKeyMeta in notification does not crash	hpersist	✅ Passes
Hash field expiration (hexpired) with SetKeyMeta in notification does not crash	hexpired	✅ Passes
PERSIST with SetKeyMeta in notification does not crash	persist	✅ Passes
COPY with SetKeyMeta in notification does not crash	copy_to	✅ Passes

Bug Fixes Required

Commands that need fixing for use-after-reallocation when SetKeyMeta is called:

• hsetexCommand - accesses o after notifyKeyspaceEvent
• hgetdelCommand - accesses o after notifyKeyspaceEvent
• hgetexCommand - accesses o after notifyKeyspaceEvent
• hdelCommand - accesses o after notifyKeyspaceEvent
• hexpireGenericCommand - accesses hashObj after notifyKeyspaceEvent

Still Not Covered (Future Work)

Event	Command/Trigger	Reason
evicted	Memory eviction	Requires maxmemory configuration