Create submissions_cancelled table

Author: jerbaroo

opsqueue/migrations/20260225164600_submissions_cancelled.sql

@@ -0,0 +1,10 @@
+CREATE TABLE submissions_cancelled
+(
+    id BIGINT PRIMARY KEY NOT NULL,
+    prefix TEXT,
+    chunks_total INTEGER NOT NULL DEFAULT 0,
+    chunks_done INTEGER NOT NULL DEFAULT 0,
+    metadata BLOB,
+    cancelled_at DATETIME NOT NULL -- Unix Timestamp
+);
+