database: return IDs to discard on `DatabaseIndexes::bulk_index` #1181

Job	Run time
Build FFI (stable, -p nostr-ffi)	1m 37s
Build (stable, -p nostr-sdk --features rocksdb)	16m 58s
Build no_std (nightly)	1m 17s
Build FFI (stable, -p nostr-sdk-ffi)	1m 58s
Build (1.66.0, -p nostr-sdk --features rocksdb)	10m 38s
Build (stable, -p nostr)	1m 36s
Build (stable, -p nostr --no-default-features --features alloc)	57s
Build WASM (stable, -p nostr)	58s
Build (stable, -p nostr --no-default-features --features "alloc all-nips")	1m 16s
Format	5s
Build WASM (stable, -p nostr-sdk)	57s
Build (stable, -p nostr --features blocking)	1m 26s
Build WASM (stable, -p nostr-sdk --features indexeddb)	1m 0s
Build (stable, -p nostr-database)	1m 1s
Build WASM (stable, -p nostr-js)	52s
Build (stable, -p nostr-sdk)	2m 2s
Build WASM (1.64.0, -p nostr)	2m 49s
Build (stable, -p nostr-sdk --no-default-features)	1m 8s
Build WASM (1.64.0, -p nostr-sdk)	3m 2s
Build (stable, -p nostr-sdk --features blocking)	1m 45s
Build WASM (1.64.0, -p nostr-sdk --features indexeddb)	3m 8s
Build (stable, -p nostr-sdk --features sqlite)	2m 7s
Build WASM (1.64.0, -p nostr-js)	2m 43s
Build (1.64.0, -p nostr)	3m 39s
Build (1.64.0, -p nostr --no-default-features --features alloc)	2m 42s
Build (1.64.0, -p nostr --no-default-features --features "alloc all-nips")	3m 12s
Build (1.64.0, -p nostr --features blocking)	3m 46s
Build (1.64.0, -p nostr-database)	3m 7s
Build (1.64.0, -p nostr-sdk)	4m 19s
Build (1.64.0, -p nostr-sdk --no-default-features)	3m 21s
Build (1.64.0, -p nostr-sdk --features blocking)	4m 3s
Build (1.64.0, -p nostr-sdk --features sqlite)	4m 39s
	1h 34m 8s

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