Fix cells unique index

README.md

@@ -4,7 +4,7 @@ Downloads mods from nexus, parses the plugins inside, and saves data to a postgr
 
 ## Development Install
 
-1. Install and run postgres.
+1. Install and run postgres (v15 or later).
 2. Create postgres user and database (and add uuid extension while you're there
    ):
 
@@ -13,6 +13,7 @@ createuser modmapper
 createdb modmapper
 sudo -u postgres -i psql
 postgres=# ALTER DATABASE modmapper OWNER TO modmapper;
+postgres=# ALTER USER modmapper CREATEDB;
 \password modmapper
 
 # Or, on Windows in PowerShell:

migrations/20231108061201_fix_cells_unique_index.sql

@@ -0,0 +1,2 @@
+DROP INDEX "cells_unique_form_id_master_and_world_id";
+CREATE UNIQUE INDEX "cells_unique_form_id_master_and_world_id" ON "cells" ("form_id", "master", "world_id") NULLS NOT DISTINCT;