Ditch case_insensitive collation

warden_server/warden_3.0_postgres.sql

 SET TimeZone='+00:00';
 
-CREATE COLLATION IF NOT EXISTS case_insensitive (
-  provider = icu,
-  locale = 'und-u-ks-level2',
-  deterministic = false
-);
-
 -- ---------------------------------------------------------
 
 --
@@ -20,9 +14,9 @@ CREATE COLLATION IF NOT EXISTS case_insensitive (
 
 CREATE TABLE IF NOT EXISTS "categories" (
   "id" int NOT NULL UNIQUE,
-  "category" text NOT NULL COLLATE case_insensitive,
-  "subcategory" text DEFAULT NULL COLLATE case_insensitive,
-  "cat_subcat" text NOT NULL COLLATE case_insensitive
+  "category" text NOT NULL,
+  "subcategory" text DEFAULT NULL,
+  "cat_subcat" text NOT NULL
 );
 
 CREATE INDEX IF NOT EXISTS "cat_sub" ON "categories" ("cat_subcat");
@@ -36,9 +30,9 @@ CREATE INDEX IF NOT EXISTS "cat_sub" ON "categories" ("cat_subcat");
 CREATE TABLE IF NOT EXISTS "clients" (
   "id" SERIAL PRIMARY KEY,
   "registered" timestamp NOT NULL DEFAULT '1970-01-01 00:00:00',
-  "requestor" text NOT NULL COLLATE case_insensitive,
-  "hostname" text NOT NULL COLLATE case_insensitive,
-  "note" text NULL COLLATE case_insensitive,
+  "requestor" text NOT NULL,
+  "hostname" text NOT NULL,
+  "note" text NULL,
   "valid" smallint NOT NULL DEFAULT '1' CHECK ("valid" >= 0),
   "name" text NOT NULL,
   "secret" text NULL,
@@ -104,7 +98,7 @@ CREATE INDEX IF NOT EXISTS "client_id" ON "last_events" ("client_id", "event_id"
 
 CREATE TABLE IF NOT EXISTS "tags" (
   "id" int NOT NULL UNIQUE,
-  "tag" text NOT NULL COLLATE case_insensitive
+  "tag" text NOT NULL
 );
 
 CREATE INDEX IF NOT EXISTS "id_tag_name" ON "tags" ("id", "tag");