diff --git a/.gitignore b/.gitignore
index cec82e6..663ce1e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,8 +8,8 @@
 /.bundle
 
 # Ignore the default SQLite database.
-/db/*.sqlite3
-/db/*.sqlite3-journal
+# /db/*.sqlite3
+# /db/*.sqlite3-journal
 
 # Ignore all logfiles and tempfiles.
 /log/*
@@ -34,7 +34,7 @@ capybara-*.html
 /log/*
 /tmp/*
 /data/*
-/db/*.sqlite3
+# /db/*.sqlite3
 /public/*
 !/public/.keep
 /coverage/
diff --git a/Gemfile b/Gemfile
index bb9d4db..f0afe27 100644
--- a/Gemfile
+++ b/Gemfile
@@ -26,6 +26,7 @@ gem "faraday_middleware-aws-sigv4", "~> 0.3.0"
 gem "faraday-excon"
 gem "uuid", "~> 2.3", ">= 2.3.9"
 gem "oj", "~> 3.16", ">= 3.16.11"
+gem "sqlite3", "~> 1.4"
 
 # This gem will allow us to write tests without the need for a database
 gem "activerecord-nulldb-adapter", "~> 1.1", ">= 1.1.1"
diff --git a/Gemfile.lock b/Gemfile.lock
index 3effb52..2916919 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -354,6 +354,9 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.13.1)
     simplecov_json_formatter (0.1.4)
+    sqlite3 (1.7.3-aarch64-linux)
+    sqlite3 (1.7.3-arm64-darwin)
+    sqlite3 (1.7.3-x86_64-linux)
     stringio (3.1.5)
     sync (0.5.0)
     systemu (2.6.5)
@@ -422,6 +425,7 @@ DEPENDENCIES
   shoryuken (~> 4.0)
   shoulda-matchers
   simplecov
+  sqlite3 (~> 1.4)
   uuid (~> 2.3, >= 2.3.9)
 
 RUBY VERSION
diff --git a/app/controllers/enrichments_controller.rb b/app/controllers/enrichments_controller.rb
new file mode 100644
index 0000000..9deacfb
--- /dev/null
+++ b/app/controllers/enrichments_controller.rb
@@ -0,0 +1,92 @@
+# frozen_string_literal: true
+
+# sample ingestion file = 20250426_arxiv_sample_3_matches
+
+class EnrichmentsController < ApplicationController
+  def doi
+    doi = fetch_doi(params[:doi])
+
+    if doi.blank?
+      render(json: { error: "doi not found" }, status: :not_found)
+      return
+    end
+
+    enrichments = Enrichment.where(doi: params[:doi])
+
+    if enrichments.empty?
+      render(json: { error: "no enrichments found for #{params[:doi]}" }, status: :not_found)
+      return
+    end
+
+    enrichments.each do |enrichment|
+      action_strategy_pattern(enrichment, doi)
+      build_enrichments_field(enrichment, doi)
+    end
+
+    render(json: doi)
+  end
+
+  def dois
+    page_size = 5
+    page = params[:page]&.to_i || 0
+    dois = Enrichment.order(:doi).distinct.offset(page_size * (page - 1)).limit(page_size).pluck(:doi)
+    enriched_dois = []
+    Rails.logger.info("########dois")
+    Rails.logger.info(dois)
+
+    dois.each do |doi|
+      enrichments = Enrichment.where(doi: doi)
+      enriched_doi = fetch_doi(doi)
+
+      next if enriched_doi.blank?
+
+      enrichments.each do |enrichment|
+        action_strategy_pattern(enrichment, enriched_doi)
+        build_enrichments_field(enrichment, enriched_doi)
+        enriched_dois << enriched_doi
+      end
+    end
+
+    render(json: enriched_dois)
+  end
+
+  private
+
+  def fetch_doi(doi)
+    response = Faraday.get("https://api.datacite.org/dois/#{doi}?detail=true&publisher=true&affiliation=true")
+    JSON.parse(response.body).dig("data", "attributes") if response.success?
+  end
+
+  def action_strategy_pattern(enrichment, doi)
+    action = enrichment["action"]
+    case action
+    when "insert"
+      doi[enrichment["field"]] ||= []
+      doi[enrichment["field"]] << enrichment["enriched_value"]
+    when "update"
+      doi[enrichment["field"]] = enrichment["enriched_value"]
+    when "update_child"
+      field = enrichment["field"]
+      doi[field].each_with_index do |item, index|
+        if item == enrichment["original_value"]
+          doi[field][index] = enrichment["enriched_value"]
+        end
+      end
+    when "delete_child"
+      field = enrichment["field"]
+      doi[field] ||= []
+      doi[field].each_with_index do |item, index|
+        if item == enrichment["original_value"]
+          doi[field].delete_at(index)
+          break
+        end
+      end
+    end
+  end
+
+  def build_enrichments_field(enrichment, doi)
+    doi["relationships"] ||= {}
+    doi["relationships"]["enrichments"] ||= []
+    doi["relationships"]["enrichments"] << enrichment
+  end
+end
diff --git a/app/models/enrichment.rb b/app/models/enrichment.rb
new file mode 100644
index 0000000..306b5ce
--- /dev/null
+++ b/app/models/enrichment.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class PocRecord < ActiveRecord::Base # rubocop:disable Rails/ApplicationRecord
+  self.abstract_class = true
+
+  connects_to database: { writing: :enrichments }
+end
+
+class Enrichment < PocRecord
+  serialize :enriched_value, coder: JSON
+  serialize :original_value, coder: JSON
+end
diff --git a/config/database.yml b/config/database.yml
index 2318259..d380a14 100644
--- a/config/database.yml
+++ b/config/database.yml
@@ -15,18 +15,32 @@ defaults: &defaults
   <<: *mysql
 
 development:
-  <<: *defaults
+  primary:
+    <<: *defaults
+
+  enrichments:
+    adapter: sqlite3
+    database: db/enrichments.sqlite3
 
 test:
   # <<: *defaults
-  adapter: nulldb
+  primary:
+    adapter: nulldb
   # database: <%= ENV['MYSQL_DATABASE'] %>_test<%= ENV['TEST_ENV_NUMBER'] %>
+  enrichments:
+    adapter: sqlite3
+    database: db/enrichments.sqlite3
 
 production:
   <<: *defaults
 
 stage:
-  <<: *defaults
+  primary:
+    <<: *defaults
+
+  enrichments:
+    adapter: sqlite3
+    database: db/enrichments.sqlite3
 
 uat:
   <<: *defaults
diff --git a/config/routes.rb b/config/routes.rb
index 86f2ddd..b6557ec 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -4,4 +4,7 @@
   get "heartbeat", to: "heartbeat#index"
 
   root to: "heartbeat#index"
+
+  get "enriched-doi/*doi", to: "enrichments#doi", constraints: { id: /.+/ }, format: false
+  get "enriched-dois", to: "enrichments#dois", constraints: { id: /.+/ }, format: false
 end
diff --git a/db/enrichments.sqlite3 b/db/enrichments.sqlite3
new file mode 100644
index 0000000..133c13d
Binary files /dev/null and b/db/enrichments.sqlite3 differ
diff --git a/lib/tasks/enrichment.rake b/lib/tasks/enrichment.rake
new file mode 100644
index 0000000..d0eb788
--- /dev/null
+++ b/lib/tasks/enrichment.rake
@@ -0,0 +1,130 @@
+# frozen_string_literal: true
+
+require "csv"
+require "json"
+
+namespace :enrichment do
+  desc "Create the enrichments sqlite database table"
+  task create_sqlite_table: :environment do
+    ActiveRecord::Base.establish_connection(:enrichments)
+    ActiveRecord::Base.connection.execute(<<-SQL)
+      CREATE TABLE IF NOT EXISTS enrichments (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        doi TEXT,
+        source TEXT,
+        process TEXT,
+        field TEXT,
+        action TEXT,
+        original_value TEXT,
+        enriched_value TEXT,
+        created DATETIME,
+        updated DATETIME,
+        produced DATETIME
+      );
+    SQL
+  end
+
+  desc "Ingest ARXIV data"
+  task ingest_arxiv: :environment do
+    csv_path = Rails.root.join("lib/data/arxiv_preprint_matching.csv")
+    count = 0
+
+    CSV.foreach(csv_path, headers: true) do |row|
+      count += 1
+
+      break if count == 2001
+
+      item = row.to_hash
+
+      enrichment = Enrichment.new(
+        doi:  item["doi"],
+        source: item["source"],
+        process: item["process"],
+        field: item["field"],
+        action: item["action"],
+        original_value: item["originalValue"],
+        enriched_value: JSON.parse(item["enrichedValue"]),
+        created: Time.current.utc,
+        updated: Time.current.utc,
+        produced: item["produced"],
+      )
+
+      if enrichment.save
+        puts("Created enrichment for #{item["doi"]}")
+      else
+        puts("Failed to create enrichment for #{item["doi"]}")
+        puts(enrichment.errors.full_messages.join(","))
+      end
+    end
+  end
+
+  # desc "Ingest ARXIV data"
+  # task ingest_arxiv: :environment do
+  #   file = File.read("lib/data/20250615_arxiv_preprint_matching_results.json")
+  #   data = JSON.parse(file)
+  #   count = 0
+
+  #   data.each do |item|
+  #     count += 1
+
+  #     break if count == 2001
+
+  #     enrichment = Enrichment.new(
+  #       doi:  item["input_doi"],
+  #       source: "COMET",
+  #       process: "10.0000/FAKE.PROCESS",
+  #       field: "relatedIdentifiers",
+  #       action: "insert",
+  #       original_value: nil,
+  #       enriched_value: {
+  #         relationType: "Preprint",
+  #         relatedIdentifier: item["matched_doi"],
+  #         relatedIdentifierType: "DOI",
+  #       },
+  #       created: Time.current.utc,
+  #       updated: Time.current.utc,
+  #       produced: Time.current.utc - 5.days,
+  #     )
+
+  #     if enrichment.save
+  #       puts("Created enrichment for #{item["input_doi"]}")
+  #     else
+  #       puts("Failed to create enrichment for #{item["input_doi"]}")
+  #       puts(enrichment.errors.full_messages.join(","))
+  #     end
+  #   end
+  # end
+
+  desc "Ingest procedural resource type"
+  task ingest_procedural_resource_type: :environment do
+    file = File.read("lib/data/datacite_procedural_resource_type_general_reclassifications_datacite_lookup_format.json")
+    data = JSON.parse(file)
+    count = 0
+
+    data.each do |item|
+      count += 1
+
+      break if count == 2001
+
+      enrichment = Enrichment.new(
+        doi:  item["doi"],
+        source: "COMET",
+        process: "10.0000/FAKE.PROCESS",
+        field: "types",
+        action: "update",
+        original_value: item["currentTypes"],
+        enriched_value: item["reclassifiedTypes"],
+        created: Time.current.utc,
+        updated: Time.current.utc,
+        produced: Time.current.utc - 5.days,
+      )
+
+      if enrichment.save
+        puts("Created enrichment for #{item["doi"]}")
+      else
+        puts("Failed to create enrichment for #{item["doi"]}")
+        puts(enrichment.errors.full_messages.join(","))
+      end
+    end
+  end
+end