Add database functions for inserting history

No real tests yet :( I would like to avoid running postgres lol

atuin-server-postgres/migrations/20230623070418_records.sql

@@ -1,6 +1,7 @@
 -- Add migration script here
 create table records (
 	id uuid primary key,            -- remember to use uuidv7 for happy indices <3
+  client_id uuid not null,        -- I am too uncomfortable with the idea of a client-generated primary key
 	host uuid not null,             -- a unique identifier for the host
 	parent uuid not null,           -- the ID of the parent record, bearing in mind this is a linked list
 	timestamp bigint not null,      -- not a timestamp type, as those do not have nanosecond precision