lppiece: Implement Piece Park

lib/harmony/harmonydb/sql/20240228-piece-park.sql

@@ -0,0 +1,30 @@
+create table parked_pieces (
+    id serial primary key,
+    created_at timestamp default current_timestamp,
+
+    piece_cid text not null,
+    piece_padded_size bigint not null,
+    piece_raw_size text not null,
+    
+    complete boolean not null default false
+);
+
+create table parked_piece_refs (
+    ref_id serial primary key,
+    piece_id int not null,
+
+    foreign key (piece_id) references parked_pieces(id) on delete cascade
+);
+
+create table park_piece_tasks (
+    task_id bigint not null
+      constraint park_piece_tasks_pk
+          primary key,
+
+    piece_ref_id int not null,
+
+    data_url text not null,
+    data_headers jsonb not null default '{}',
+    data_raw_size bigint not null,
+    data_delete_on_finalize bool not null
+);