liz/PluralKit
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Add upgrade from legacy doc in README (#204)

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Co-authored-by: Astrid <voltasalt@gmail.com>
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@ -54,8 +54,34 @@ $ docker-compose up -d
(tip: use `scripts/run-test-db.sh` to run a temporary PostgreSQL database on your local system. Requires Docker.)
# Upgrading database from legacy version
There are a few adjustments to do for the new versions of PluralKit to work with a legacy PluralKit database :
* Dump the database (you never know what may happen !)
* Upgrade the database by firing those lines in psql (or by putting them in an sql file and giving it to postgres) :
```sql
do $$ begin
create type proxy_tag as (
prefix text,
suffix text
);
exception when duplicate_object then null;
end $$;
alter table members add column IF NOT EXISTS display_name text;
alter table members add column IF NOT EXISTS proxy_tags proxy_tag[] not null default array[]::proxy_tag[];
alter table members add column IF NOT EXISTS keep_proxy bool not null default false;
update members set proxy_tags = array[(members.prefix, members.suffix)]::proxy_tag[] where members.prefix is not null or members.suffix is not null;
alter table members drop column IF EXISTS prefix cascade;
alter table members drop column IF EXISTS suffix cascade;
alter table messages add column IF NOT EXISTS original_mid bigint;
alter table servers add column IF NOT EXISTS log_blacklist bigint[] not null default array[]::bigint[];
alter table servers add column IF NOT EXISTS blacklist bigint[] not null default array[]::bigint[];
```
* Start PluralKit and let it finish the automatic database upgrades
# Documentation
See [the docs/ directory](./docs/README.md)
# License
This project is under the Apache License, Version 2.0. It is available at the following link: https://www.apache.org/licenses/LICENSE-2.0
This project is under the Apache License, Version 2.0. It is available at the following link: https://www.apache.org/licenses/LICENSE-2.0