feat: adds crawl resource cache

migrations/005_parse_resource_cache.sql

@@ -0,0 +1,21 @@
+ALTER TABLE crawl_runs
+ADD COLUMN IF NOT EXISTS skipped_count INTEGER NOT NULL DEFAULT 0;
+
+CREATE TABLE IF NOT EXISTS parse_resource_cache (
+  id SERIAL PRIMARY KEY,
+  profile_key VARCHAR(255) NOT NULL,
+  resource_key VARCHAR(255) NOT NULL,
+  method VARCHAR(16) NOT NULL,
+  url TEXT NOT NULL,
+  request_fingerprint VARCHAR(64) NOT NULL,
+  etag TEXT,
+  last_modified TEXT,
+  body_hash VARCHAR(64) NOT NULL,
+  body_snapshot BYTEA NOT NULL,
+  parser_version VARCHAR(32),
+  fetched_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  CONSTRAINT uq_parse_resource_cache_resource UNIQUE (profile_key, resource_key, request_fingerprint)
+);
+
+CREATE INDEX IF NOT EXISTS ix_parse_resource_cache_profile_key
+  ON parse_resource_cache (profile_key);