feat: add new required slug property to coder_app, use in URLs (#4573)

coderd/database/migrations/000066_app_slug.down.sql

@@ -0,0 +1,5 @@
+-- drop unique index on "slug" column
+ALTER TABLE "workspace_apps" DROP CONSTRAINT IF EXISTS "workspace_apps_agent_id_slug_idx";
+
+-- drop "slug" column from "workspace_apps" table
+ALTER TABLE "workspace_apps" DROP COLUMN "slug";

coderd/database/migrations/000066_app_slug.up.sql

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+BEGIN;
+
+-- add "slug" column to "workspace_apps" table
+ALTER TABLE "workspace_apps" ADD COLUMN "slug" text DEFAULT '';
+
+-- copy the "name" column for each workspace app to the "slug" column
+UPDATE "workspace_apps" SET "slug" = "name";
+
+-- make "slug" column not nullable and remove default
+ALTER TABLE "workspace_apps" ALTER COLUMN "slug" SET NOT NULL;
+ALTER TABLE "workspace_apps" ALTER COLUMN "slug" DROP DEFAULT;
+
+-- add unique index on "slug" column
+ALTER TABLE "workspace_apps" ADD CONSTRAINT "workspace_apps_agent_id_slug_idx" UNIQUE ("agent_id", "slug");
+
+COMMIT;

coderd/database/migrations/000067_app_display_name.down.sql

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+BEGIN;
+
+-- Select all apps with an extra "row_number" column that determines the "rank"
+-- of the display name against other display names in the same agent.
+WITH row_numbers AS (
+    SELECT
+        *,
+        row_number() OVER (PARTITION BY agent_id, display_name ORDER BY display_name ASC) AS row_number
+    FROM
+        workspace_apps
+)
+
+-- Update any app with a "row_number" greater than 1 to have the row number
+-- appended to the display name. This effectively means that all lowercase
+-- display names remain untouched, while non-unique mixed case usernames are
+-- appended with a unique number. If you had three apps called all called asdf,
+-- they would then be renamed to e.g. asdf, asdf1234, and asdf5678.
+UPDATE
+    workspace_apps
+SET
+    display_name = workspace_apps.display_name || floor(random() * 10000)::text
+FROM
+    row_numbers
+WHERE
+    workspace_apps.id = row_numbers.id AND
+    row_numbers.row_number > 1;
+
+-- rename column "display_name" to "name" on "workspace_apps"
+ALTER TABLE "workspace_apps" RENAME COLUMN "display_name" TO "name";
+
+-- restore unique index on "workspace_apps" table
+ALTER TABLE workspace_apps ADD CONSTRAINT workspace_apps_agent_id_name_key UNIQUE ("agent_id", "name");
+
+COMMIT;

coderd/database/migrations/000067_app_display_name.up.sql

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+BEGIN;
+
+-- rename column "name" to "display_name" on "workspace_apps"
+ALTER TABLE "workspace_apps" RENAME COLUMN "name" TO "display_name";
+
+-- drop constraint "workspace_apps_agent_id_name_key" on "workspace_apps".
+ALTER TABLE ONLY workspace_apps DROP CONSTRAINT IF EXISTS workspace_apps_agent_id_name_key;
+
+COMMIT;