Update watched addresses table to track gap filling

db/migrations/00017_create_watched_addresses_table.sql

@@ -1,7 +1,9 @@
 -- +goose Up
 CREATE TABLE eth.watched_addresses (
-    address               VARCHAR(66) PRIMARY KEY,
-    added_at              BIGINT NOT NULL
+    address                 VARCHAR(66) PRIMARY KEY,
+    created_at              BIGINT NOT NULL,
+    watched_at              BIGINT NOT NULL,
+    last_filled_at          BIGINT NOT NULL DEFAULT 0
 );
 
 -- +goose Down

schema.sql

@@ -558,7 +558,9 @@ ALTER SEQUENCE eth.uncle_cids_id_seq OWNED BY eth.uncle_cids.id;
 
 CREATE TABLE eth.watched_addresses (
     address character varying(66) NOT NULL,
-    added_at bigint NOT NULL
+    created_at bigint NOT NULL,
+    watched_at bigint NOT NULL,
+    last_filled_at bigint DEFAULT 0 NOT NULL
 );