Make Parcel Names Unique

deployment/hasura/migrations/Aerie/34_unique_parcel_names/down.sql

@@ -0,0 +1,2 @@
+alter table sequencing.parcel drop constraint parcel_name_key;
+call migrations.mark_migration_rolled_back(34);

deployment/hasura/migrations/Aerie/34_unique_parcel_names/up.sql

@@ -0,0 +1,31 @@
+-- Data migration: deduplicate parcel names:
+do $$
+begin
+  -- While there are duplicate names in the parcel table...
+  while exists(
+    select from sequencing.parcel
+    group by name
+    having count(name) > 1
+  ) loop
+    -- ...deduplicate them
+    update sequencing.parcel
+    set name = name || '(' || ir.row || ')'
+    from (
+        select id, row_number() over (partition by name) - 1 as row
+        from sequencing.parcel
+        where name in (
+          select p.name
+          from sequencing.parcel p
+          group by p.name
+          having count(1) > 1)
+    ) as ir
+    where ir.id = parcel.id
+    and row > 0;
+end loop;
+end $$;
+
+-- Add new uniqueness constraint to the parcel name
+alter table sequencing.parcel
+add unique(name);
+
+call migrations.mark_migration_applied(34);

deployment/postgres-init-db/sql/applied_migrations.sql

@@ -35,3 +35,4 @@ call migrations.mark_migration_applied(30);
 call migrations.mark_migration_applied(31);
 call migrations.mark_migration_applied(32);
 call migrations.mark_migration_applied(33);
+call migrations.mark_migration_applied(34);

deployment/postgres-init-db/sql/tables/sequencing/parcel.sql

@@ -1,7 +1,7 @@
 create table sequencing.parcel (
   id integer generated always as identity,
 
-  name text not null,
+  name text not null unique,
 
   command_dictionary_id integer not null,
   channel_dictionary_id integer default null,