chore: remove chats experiment (#18535)

coderd/database/queries/chat.sql

@@ -1,36 +0,0 @@
--- name: InsertChat :one
-INSERT INTO chats (owner_id, created_at, updated_at, title)
-VALUES ($1, $2, $3, $4)
-RETURNING *;
-
--- name: UpdateChatByID :exec
-UPDATE chats
-SET title = $2, updated_at = $3
-WHERE id = $1;
-
--- name: GetChatsByOwnerID :many
-SELECT * FROM chats
-WHERE owner_id = $1
-ORDER BY created_at DESC;
-
--- name: GetChatByID :one
-SELECT * FROM chats
-WHERE id = $1;
-
--- name: InsertChatMessages :many
-INSERT INTO chat_messages (chat_id, created_at, model, provider, content)
-SELECT
-    @chat_id :: uuid AS chat_id,
-    @created_at :: timestamptz AS created_at,
-    @model :: VARCHAR(127) AS model,
-    @provider :: VARCHAR(127) AS provider,
-    jsonb_array_elements(@content :: jsonb) AS content
-RETURNING chat_messages.*;
-
--- name: GetChatMessagesByChatID :many
-SELECT * FROM chat_messages
-WHERE chat_id = $1
-ORDER BY created_at ASC;
-
--- name: DeleteChat :exec
-DELETE FROM chats WHERE id = $1;