store: Add a materialized view 'info.chain_sizes'

store/postgres/migrations/2023-01-24-192319_chain_size_view/down.sql

@@ -0,0 +1,10 @@
+-- This file should undo anything in `up.sql`
+
+drop view if exists info.all_sizes;
+
+create view info.all_sizes as
+select * from info.subgraph_sizes
+union all
+select * from info.table_sizes;
+
+drop materialized view if exists info.chain_sizes;

store/postgres/migrations/2023-01-24-192319_chain_size_view/up.sql

@@ -0,0 +1,34 @@
+
+drop materialized view if exists info.chain_sizes;
+
+create materialized view info.chain_sizes as
+select *,
+       pg_size_pretty(total_bytes) as total,
+       pg_size_pretty(index_bytes) as index,
+       pg_size_pretty(toast_bytes) as toast,
+       pg_size_pretty(table_bytes) as table
+  from (
+    select *,
+           total_bytes-index_bytes-coalesce(toast_bytes,0) AS table_bytes
+      from (
+        select nspname as table_schema, relname as table_name,
+               'shared'::text as version,
+               c.reltuples as row_estimate,
+               pg_total_relation_size(c.oid) as total_bytes,
+               pg_indexes_size(c.oid) as index_bytes,
+               pg_total_relation_size(reltoastrelid) as toast_bytes
+          from pg_class c
+               join pg_namespace n on n.oid = c.relnamespace
+          where relkind = 'r'
+            and nspname like 'chain%'
+  ) a
+) a with no data;
+
+drop view if exists info.all_sizes;
+
+create view info.all_sizes as
+select * from info.subgraph_sizes
+union all
+select * from info.chain_sizes
+union all
+select * from info.table_sizes;