utilize eth key preimage table

postgres/db/migrations/00001_create_ipfs_blocks_table.sql

@@ -0,0 +1,8 @@
+-- +goose Up
+CREATE TABLE IF NOT EXISTS public.blocks (
+  key TEXT UNIQUE NOT NULL,
+  data BYTEA NOT NULL
+);
+
+-- +goose Down
+DROP TABLE public.blocks;

postgres/db/migrations/00002_create_eth_schema.sql

@@ -0,0 +1,5 @@
+-- +goose Up
+CREATE SCHEMA eth;
+
+-- +goose Down
+DROP SCHEMA eth;

postgres/db/migrations/00003_create_eth_key_preimages_table.sql

@@ -0,0 +1,8 @@
+-- +goose Up
+CREATE TABLE IF NOT EXISTS eth.key_preimages (
+  eth_key BYTEA UNIQUE NOT NULL,
+  ipfs_key TEXT NOT NULL REFERENCES public.blocks (key) ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
+);
+
+-- +goose Down
+DROP TABLE eth.key_preimages;