device_ignore table to track devices to skip in polling

share/schema_versions/App-Netdisco-DB-41-42-PostgreSQL.sql

@@ -0,0 +1,12 @@
+BEGIN;
+
+CREATE TABLE "device_ignore" (
+  "backend" text NOT NULL,
+  "device" inet NOT NULL,
+  "action" text NOT NULL,
+  "failures" integer DEFAULT 0,
+  "ignore" boolean DEFAULT false,
+  PRIMARY KEY ("backend", "device", "action")
+);
+
+COMMIT;