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doc/PLUGINS.md: Clarify that db_write hook only works on SQLITE3.

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I noticed that `wallet/db_postgres.c` never actually calls `db_changes_add`.

PostgreSQL arguably has a better replication system (a PostgreSQL cluster)
than what `db_write` hook can offer, so rather than make `db_write` work on
PostgreSQL, just document that it does not actually work there.

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ZmnSCPxj jxPCSnmZ 2021-11-23 14:08:01 +08:00 committed by ZmnSCPxj, ZmnSCPxj jxPCSmnZ
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doc/PLUGINS.md
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@ -939,7 +939,11 @@ hook subscribers would not get called.
### `db_write`
This hook is called whenever a change is about to be committed to the database.
This hook is called whenever a change is about to be committed to the database,
if you are using a SQLITE3 database (the default).
This hook will be useless (the `"writes"` field will always be empty) if you are
using a PostgreSQL database.
It is currently extremely restricted:
1. a plugin registering for this hook should not perform anything that may cause