feat: add worker distributor and model registry

internal/workscheduler/queries.sql

@@ -0,0 +1,56 @@
+-- name: Ping :one
+SELECT 1;
+
+-- name: GetCurrentQueueSize :one
+SELECT 
+    COUNT(*) current_queue_size
+FROM
+    work_schedule
+WHERE
+        worker_id = $1
+    AND state <> 'archived';
+
+-- name: InsertQueueItem :exec
+INSERT INTO work_schedule
+    (
+          schedule_id
+        , worker_id
+        , start_run
+        , end_run
+        , state
+    )
+VALUES
+    (
+          $1
+        , $2
+        , $3
+        , $4
+        , 'pending'
+    );
+
+
+-- name: GetNext :one
+SELECT 
+    *
+FROM 
+    work_schedule
+WHERE
+        worker_id = $1
+    AND state = 'pending'
+ORDER BY updated_at DESC
+LIMIT 1;
+
+-- name: StartProcessing :exec
+UPDATE work_schedule
+SET
+    state = 'processing'
+WHERE
+    schedule_id = $1;
+
+-- name: Archive :exec
+UPDATE work_schedule
+SET
+    state = 'archived'
+WHERE
+    schedule_id = $1;
+