From 4d462385b34b2e3f57aa33ff88643eb5e508f6da Mon Sep 17 00:00:00 2001
From: Eugene Burmakin <iamfrey@gmail.com>
Date: Thu, 8 Jan 2026 00:05:11 +0100
Subject: [PATCH 1/3] Add immediate verification and count validation to raw
 data archiving

---
 app/jobs/points/raw_data/verify_job.rb        |  21 +++
 app/models/points/raw_data_archive.rb         |  30 ++++
 app/services/points/raw_data/archiver.rb      |  89 +++++++++-
 .../points/raw_data/chunk_compressor.rb       |   7 +-
 config/schedule.yml                           |   5 +
 .../services/points/raw_data/archiver_spec.rb | 153 ++++++++++++++++++
 .../points/raw_data/chunk_compressor_spec.rb  |  44 ++++-
 7 files changed, 336 insertions(+), 13 deletions(-)
 create mode 100644 app/jobs/points/raw_data/verify_job.rb

diff --git a/app/jobs/points/raw_data/verify_job.rb b/app/jobs/points/raw_data/verify_job.rb
new file mode 100644
index 00000000..bf5aecce
--- /dev/null
+++ b/app/jobs/points/raw_data/verify_job.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module Points
+  module RawData
+    class VerifyJob < ApplicationJob
+      queue_as :archival
+
+      def perform
+        return unless ENV['ARCHIVE_RAW_DATA'] == 'true'
+
+        stats = Points::RawData::Verifier.new.call
+
+        Rails.logger.info("Verification job complete: #{stats}")
+      rescue StandardError => e
+        ExceptionReporter.call(e, 'Points raw data verification job failed')
+
+        raise
+      end
+    end
+  end
+end
diff --git a/app/models/points/raw_data_archive.rb b/app/models/points/raw_data_archive.rb
index 4657e091..a270a5c4 100644
--- a/app/models/points/raw_data_archive.rb
+++ b/app/models/points/raw_data_archive.rb
@@ -13,8 +13,11 @@ module Points
     validates :year, numericality: { greater_than: 1970, less_than: 2100 }
     validates :month, numericality: { greater_than_or_equal_to: 1, less_than_or_equal_to: 12 }
     validates :chunk_number, numericality: { greater_than: 0 }
+    validates :point_count, numericality: { greater_than: 0 }
     validates :point_ids_checksum, presence: true
 
+    validate :metadata_contains_expected_and_actual_counts
+
     scope :for_month, lambda { |user_id, year, month|
       where(user_id: user_id, year: year, month: month)
         .order(:chunk_number)
@@ -36,5 +39,32 @@ module Points
 
       (file.blob.byte_size / 1024.0 / 1024.0).round(2)
     end
+
+    def verified?
+      verified_at.present?
+    end
+
+    def count_mismatch?
+      return false unless metadata.present?
+
+      expected = metadata['expected_count']
+      actual = metadata['actual_count']
+
+      return false if expected.nil? || actual.nil?
+
+      expected != actual
+    end
+
+    private
+
+    def metadata_contains_expected_and_actual_counts
+      return if metadata.blank?
+      return if metadata['format_version'].blank?
+
+      # All archives must contain both expected_count and actual_count for data integrity
+      if metadata['expected_count'].blank? || metadata['actual_count'].blank?
+        errors.add(:metadata, 'must contain expected_count and actual_count')
+      end
+    end
   end
 end
diff --git a/app/services/points/raw_data/archiver.rb b/app/services/points/raw_data/archiver.rb
index 350a8c24..53d439e6 100644
--- a/app/services/points/raw_data/archiver.rb
+++ b/app/services/points/raw_data/archiver.rb
@@ -97,6 +97,15 @@ module Points
         log_archival_start(user_id, year, month, point_ids.count)
 
         archive = create_archive_chunk(user_id, year, month, points, point_ids)
+
+        # Immediate verification before marking points as archived
+        verification_result = verify_archive_immediately(archive, point_ids)
+        unless verification_result[:success]
+          Rails.logger.error("Immediate verification failed: #{verification_result[:error]}")
+          archive.destroy  # Cleanup failed archive
+          raise StandardError, "Archive verification failed: #{verification_result[:error]}"
+        end
+
         mark_points_as_archived(point_ids, archive.id)
         update_stats(point_ids.count)
         log_archival_success(archive)
@@ -144,8 +153,22 @@ module Points
                        .where(user_id: user_id, year: year, month: month)
                        .maximum(:chunk_number).to_i + 1
 
-        # Compress points data
-        compressed_data = Points::RawData::ChunkCompressor.new(points).compress
+        # Compress points data and get count
+        compression_result = Points::RawData::ChunkCompressor.new(points).compress
+        compressed_data = compression_result[:data]
+        actual_count = compression_result[:count]
+
+        # Validate count: critical data integrity check
+        expected_count = point_ids.count
+        if actual_count != expected_count
+          error_msg = "Archive count mismatch for user #{user_id} #{year}-#{format('%02d', month)}: " \
+                      "expected #{expected_count} points, but only #{actual_count} were compressed"
+          Rails.logger.error(error_msg)
+          ExceptionReporter.call(StandardError.new(error_msg), error_msg)
+          raise StandardError, error_msg
+        end
+
+        Rails.logger.info("✓ Compression validated: #{actual_count}/#{expected_count} points")
 
         # Create archive record
         archive = Points::RawDataArchive.create!(
@@ -153,13 +176,15 @@ module Points
           year: year,
           month: month,
           chunk_number: chunk_number,
-          point_count: point_ids.count,
+          point_count: actual_count,  # Use actual count, not assumed
           point_ids_checksum: calculate_checksum(point_ids),
           archived_at: Time.current,
           metadata: {
             format_version: 1,
             compression: 'gzip',
-            archived_by: 'Points::RawData::Archiver'
+            archived_by: 'Points::RawData::Archiver',
+            expected_count: expected_count,
+            actual_count: actual_count
           }
         )
 
@@ -179,6 +204,62 @@ module Points
       def calculate_checksum(point_ids)
         Digest::SHA256.hexdigest(point_ids.sort.join(','))
       end
+
+      def verify_archive_immediately(archive, expected_point_ids)
+        # Lightweight verification immediately after archiving
+        # Ensures archive is valid before marking points as archived
+
+        # 1. Verify file is attached
+        unless archive.file.attached?
+          return { success: false, error: 'File not attached' }
+        end
+
+        # 2. Verify file can be downloaded
+        begin
+          compressed_content = archive.file.blob.download
+        rescue StandardError => e
+          return { success: false, error: "File download failed: #{e.message}" }
+        end
+
+        # 3. Verify file size is reasonable
+        if compressed_content.bytesize.zero?
+          return { success: false, error: 'File is empty' }
+        end
+
+        # 4. Verify file can be decompressed and parse JSONL
+        begin
+          io = StringIO.new(compressed_content)
+          gz = Zlib::GzipReader.new(io)
+          archived_point_ids = []
+
+          gz.each_line do |line|
+            data = JSON.parse(line)
+            archived_point_ids << data['id']
+          end
+
+          gz.close
+        rescue StandardError => e
+          return { success: false, error: "Decompression/parsing failed: #{e.message}" }
+        end
+
+        # 5. Verify point count matches
+        if archived_point_ids.count != expected_point_ids.count
+          return {
+            success: false,
+            error: "Point count mismatch in archive: expected #{expected_point_ids.count}, found #{archived_point_ids.count}"
+          }
+        end
+
+        # 6. Verify point IDs checksum matches
+        archived_checksum = calculate_checksum(archived_point_ids)
+        expected_checksum = calculate_checksum(expected_point_ids)
+        if archived_checksum != expected_checksum
+          return { success: false, error: 'Point IDs checksum mismatch in archive' }
+        end
+
+        Rails.logger.info("✓ Immediate verification passed for archive #{archive.id}")
+        { success: true }
+      end
     end
   end
 end
diff --git a/app/services/points/raw_data/chunk_compressor.rb b/app/services/points/raw_data/chunk_compressor.rb
index bf26e66b..8d389857 100644
--- a/app/services/points/raw_data/chunk_compressor.rb
+++ b/app/services/points/raw_data/chunk_compressor.rb
@@ -10,15 +10,20 @@ module Points
       def compress
         io = StringIO.new
         gz = Zlib::GzipWriter.new(io)
+        written_count = 0
 
         # Stream points to avoid memory issues with large months
         @points.select(:id, :raw_data).find_each(batch_size: 1000) do |point|
           # Write as JSONL (one JSON object per line)
           gz.puts({ id: point.id, raw_data: point.raw_data }.to_json)
+          written_count += 1
         end
 
         gz.close
-        io.string.force_encoding(Encoding::ASCII_8BIT)  # Returns compressed bytes in binary encoding
+        compressed_data = io.string.force_encoding(Encoding::ASCII_8BIT)
+
+        # Return both compressed data and count for validation
+        { data: compressed_data, count: written_count }
       end
     end
   end
diff --git a/config/schedule.yml b/config/schedule.yml
index 84cf04b1..d3e14cba 100644
--- a/config/schedule.yml
+++ b/config/schedule.yml
@@ -59,3 +59,8 @@ rails_pulse_clean_up_job:
   cron: "0 1 * * *" # every day at 01:00
   class: "RailsPulse::CleanupJob"
   queue: default
+
+raw_data_archive_verification_job:
+  cron: "0 3 * * *" # every day at 03:00
+  class: "Points::RawData::VerifyJob"
+  queue: archival
diff --git a/spec/services/points/raw_data/archiver_spec.rb b/spec/services/points/raw_data/archiver_spec.rb
index 259056de..da9c2f11 100644
--- a/spec/services/points/raw_data/archiver_spec.rb
+++ b/spec/services/points/raw_data/archiver_spec.rb
@@ -199,4 +199,157 @@ RSpec.describe Points::RawData::Archiver do
       expect(result[:failed]).to eq(0)
     end
   end
+
+  describe 'count validation (P0 implementation)' do
+    before do
+      allow(ENV).to receive(:[]).and_call_original
+      allow(ENV).to receive(:[]).with('ARCHIVE_RAW_DATA').and_return('true')
+    end
+
+    let(:test_date) { 3.months.ago.beginning_of_month.utc }
+    let!(:test_points) do
+      create_list(:point, 5, user: user,
+                            timestamp: test_date.to_i,
+                            raw_data: { lon: 13.4, lat: 52.5 })
+    end
+
+    it 'validates compression count matches expected count' do
+      archiver.archive_specific_month(user.id, test_date.year, test_date.month)
+
+      archive = user.raw_data_archives.last
+      expect(archive.point_count).to eq(5)
+      expect(archive.metadata['expected_count']).to eq(5)
+      expect(archive.metadata['actual_count']).to eq(5)
+    end
+
+    it 'stores both expected and actual counts in metadata' do
+      archiver.archive_specific_month(user.id, test_date.year, test_date.month)
+
+      archive = user.raw_data_archives.last
+      expect(archive.metadata).to have_key('expected_count')
+      expect(archive.metadata).to have_key('actual_count')
+      expect(archive.metadata['expected_count']).to eq(archive.metadata['actual_count'])
+    end
+
+    it 'raises error when compression count mismatch occurs' do
+      # Create proper gzip compressed data with only 3 points instead of 5
+      io = StringIO.new
+      gz = Zlib::GzipWriter.new(io)
+      3.times do |i|
+        gz.puts({ id: i, raw_data: { test: 'data' } }.to_json)
+      end
+      gz.close
+      fake_compressed_data = io.string.force_encoding(Encoding::ASCII_8BIT)
+
+      # Mock ChunkCompressor to return mismatched count
+      fake_compressor = instance_double(Points::RawData::ChunkCompressor)
+      allow(Points::RawData::ChunkCompressor).to receive(:new).and_return(fake_compressor)
+      allow(fake_compressor).to receive(:compress).and_return(
+        { data: fake_compressed_data, count: 3 }  # Returning 3 instead of 5
+      )
+
+      expect do
+        archiver.archive_specific_month(user.id, test_date.year, test_date.month)
+      end.to raise_error(StandardError, /Archive count mismatch/)
+    end
+
+    it 'does not mark points as archived if count mismatch detected' do
+      # Create proper gzip compressed data with only 3 points instead of 5
+      io = StringIO.new
+      gz = Zlib::GzipWriter.new(io)
+      3.times do |i|
+        gz.puts({ id: i, raw_data: { test: 'data' } }.to_json)
+      end
+      gz.close
+      fake_compressed_data = io.string.force_encoding(Encoding::ASCII_8BIT)
+
+      # Mock ChunkCompressor to return mismatched count
+      fake_compressor = instance_double(Points::RawData::ChunkCompressor)
+      allow(Points::RawData::ChunkCompressor).to receive(:new).and_return(fake_compressor)
+      allow(fake_compressor).to receive(:compress).and_return(
+        { data: fake_compressed_data, count: 3 }
+      )
+
+      expect do
+        archiver.archive_specific_month(user.id, test_date.year, test_date.month)
+      end.to raise_error(StandardError)
+
+      # Verify points are NOT marked as archived
+      test_points.each(&:reload)
+      expect(test_points.none?(&:raw_data_archived)).to be true
+    end
+  end
+
+  describe 'immediate verification (P0 implementation)' do
+    before do
+      allow(ENV).to receive(:[]).and_call_original
+      allow(ENV).to receive(:[]).with('ARCHIVE_RAW_DATA').and_return('true')
+    end
+
+    let(:test_date) { 3.months.ago.beginning_of_month.utc }
+    let!(:test_points) do
+      create_list(:point, 3, user: user,
+                            timestamp: test_date.to_i,
+                            raw_data: { lon: 13.4, lat: 52.5 })
+    end
+
+    it 'runs immediate verification after archiving' do
+      # Spy on the verify_archive_immediately method
+      allow(archiver).to receive(:verify_archive_immediately).and_call_original
+
+      archiver.archive_specific_month(user.id, test_date.year, test_date.month)
+
+      expect(archiver).to have_received(:verify_archive_immediately)
+    end
+
+    it 'rolls back archive if immediate verification fails' do
+      # Mock verification to fail
+      allow(archiver).to receive(:verify_archive_immediately).and_return(
+        { success: false, error: 'Test verification failure' }
+      )
+
+      expect do
+        archiver.archive_specific_month(user.id, test_date.year, test_date.month)
+      end.to raise_error(StandardError, /Archive verification failed/)
+
+      # Verify archive was destroyed
+      expect(Points::RawDataArchive.count).to eq(0)
+
+      # Verify points are NOT marked as archived
+      test_points.each(&:reload)
+      expect(test_points.none?(&:raw_data_archived)).to be true
+    end
+
+    it 'completes successfully when immediate verification passes' do
+      archiver.archive_specific_month(user.id, test_date.year, test_date.month)
+
+      # Verify archive was created
+      expect(Points::RawDataArchive.count).to eq(1)
+
+      # Verify points ARE marked as archived
+      test_points.each(&:reload)
+      expect(test_points.all?(&:raw_data_archived)).to be true
+    end
+
+    it 'validates point IDs checksum during immediate verification' do
+      archiver.archive_specific_month(user.id, test_date.year, test_date.month)
+
+      archive = user.raw_data_archives.last
+      expect(archive.point_ids_checksum).to be_present
+
+      # Decompress and verify the archived point IDs match
+      compressed_content = archive.file.blob.download
+      io = StringIO.new(compressed_content)
+      gz = Zlib::GzipReader.new(io)
+      archived_point_ids = []
+
+      gz.each_line do |line|
+        data = JSON.parse(line)
+        archived_point_ids << data['id']
+      end
+      gz.close
+
+      expect(archived_point_ids.sort).to eq(test_points.map(&:id).sort)
+    end
+  end
 end
diff --git a/spec/services/points/raw_data/chunk_compressor_spec.rb b/spec/services/points/raw_data/chunk_compressor_spec.rb
index c8d66983..f27bbdc0 100644
--- a/spec/services/points/raw_data/chunk_compressor_spec.rb
+++ b/spec/services/points/raw_data/chunk_compressor_spec.rb
@@ -19,14 +19,26 @@ RSpec.describe Points::RawData::ChunkCompressor do
   let(:compressor) { described_class.new(Point.where(id: points.map(&:id))) }
 
   describe '#compress' do
-    it 'returns compressed gzip data' do
+    it 'returns a hash with data and count' do
       result = compressor.compress
-      expect(result).to be_a(String)
-      expect(result.encoding.name).to eq('ASCII-8BIT')
+
+      expect(result).to be_a(Hash)
+      expect(result).to have_key(:data)
+      expect(result).to have_key(:count)
+      expect(result[:data]).to be_a(String)
+      expect(result[:data].encoding.name).to eq('ASCII-8BIT')
+      expect(result[:count]).to eq(3)
+    end
+
+    it 'returns correct count of compressed points' do
+      result = compressor.compress
+
+      expect(result[:count]).to eq(points.count)
     end
 
     it 'compresses points as JSONL format' do
-      compressed = compressor.compress
+      result = compressor.compress
+      compressed = result[:data]
 
       # Decompress and verify format
       io = StringIO.new(compressed)
@@ -35,6 +47,7 @@ RSpec.describe Points::RawData::ChunkCompressor do
       gz.close
 
       expect(lines.count).to eq(3)
+      expect(result[:count]).to eq(3)
 
       # Each line should be valid JSON
       lines.each_with_index do |line, index|
@@ -46,7 +59,8 @@ RSpec.describe Points::RawData::ChunkCompressor do
     end
 
     it 'includes point ID and raw_data in each line' do
-      compressed = compressor.compress
+      result = compressor.compress
+      compressed = result[:data]
 
       io = StringIO.new(compressed)
       gz = Zlib::GzipReader.new(io)
@@ -58,7 +72,7 @@ RSpec.describe Points::RawData::ChunkCompressor do
       expect(data['raw_data']).to eq({ 'lon' => 13.4, 'lat' => 52.5 })
     end
 
-    it 'processes points in batches' do
+    it 'processes points in batches and returns correct count' do
       # Create many points to test batch processing with unique timestamps
       many_points = []
       base_time = Time.new(2024, 6, 15).to_i
@@ -67,7 +81,8 @@ RSpec.describe Points::RawData::ChunkCompressor do
       end
       large_compressor = described_class.new(Point.where(id: many_points.map(&:id)))
 
-      compressed = large_compressor.compress
+      result = large_compressor.compress
+      compressed = result[:data]
 
       io = StringIO.new(compressed)
       gz = Zlib::GzipReader.new(io)
@@ -76,10 +91,12 @@ RSpec.describe Points::RawData::ChunkCompressor do
       gz.close
 
       expect(line_count).to eq(2500)
+      expect(result[:count]).to eq(2500)
     end
 
     it 'produces smaller compressed output than uncompressed' do
-      compressed = compressor.compress
+      result = compressor.compress
+      compressed = result[:data]
 
       # Decompress to get original size
       io = StringIO.new(compressed)
@@ -90,5 +107,16 @@ RSpec.describe Points::RawData::ChunkCompressor do
       # Compressed should be smaller
       expect(compressed.bytesize).to be < decompressed.bytesize
     end
+
+    context 'with empty point set' do
+      let(:empty_compressor) { described_class.new(Point.none) }
+
+      it 'returns zero count for empty point set' do
+        result = empty_compressor.compress
+
+        expect(result[:count]).to eq(0)
+        expect(result[:data]).to be_a(String)
+      end
+    end
   end
 end

From 6b60eff90dd66542e6b0600b39391f49a32ffe1c Mon Sep 17 00:00:00 2001
From: Eugene Burmakin <iamfrey@gmail.com>
Date: Thu, 8 Jan 2026 00:10:01 +0100
Subject: [PATCH 2/3] Remove verifying job

---
 app/jobs/points/raw_data/verify_job.rb | 21 ---------------------
 config/schedule.yml                    |  5 -----
 2 files changed, 26 deletions(-)
 delete mode 100644 app/jobs/points/raw_data/verify_job.rb

diff --git a/app/jobs/points/raw_data/verify_job.rb b/app/jobs/points/raw_data/verify_job.rb
deleted file mode 100644
index bf5aecce..00000000
--- a/app/jobs/points/raw_data/verify_job.rb
+++ /dev/null
@@ -1,21 +0,0 @@
-# frozen_string_literal: true
-
-module Points
-  module RawData
-    class VerifyJob < ApplicationJob
-      queue_as :archival
-
-      def perform
-        return unless ENV['ARCHIVE_RAW_DATA'] == 'true'
-
-        stats = Points::RawData::Verifier.new.call
-
-        Rails.logger.info("Verification job complete: #{stats}")
-      rescue StandardError => e
-        ExceptionReporter.call(e, 'Points raw data verification job failed')
-
-        raise
-      end
-    end
-  end
-end
diff --git a/config/schedule.yml b/config/schedule.yml
index d3e14cba..84cf04b1 100644
--- a/config/schedule.yml
+++ b/config/schedule.yml
@@ -59,8 +59,3 @@ rails_pulse_clean_up_job:
   cron: "0 1 * * *" # every day at 01:00
   class: "RailsPulse::CleanupJob"
   queue: default
-
-raw_data_archive_verification_job:
-  cron: "0 3 * * *" # every day at 03:00
-  class: "Points::RawData::VerifyJob"
-  queue: archival

From f74828cc6b2888da5bb755bff843d5ce87b17ef0 Mon Sep 17 00:00:00 2001
From: Eugene Burmakin <iamfrey@gmail.com>
Date: Fri, 9 Jan 2026 00:27:32 +0100
Subject: [PATCH 3/3] Add archive metrics reporting

---
 .../metrics/archives/compression_ratio.rb     | 22 ++++++
 .../metrics/archives/count_mismatch.rb        | 42 +++++++++++
 app/services/metrics/archives/operation.rb    | 30 ++++++++
 .../metrics/archives/points_archived.rb       | 25 +++++++
 app/services/metrics/archives/size.rb         | 29 +++++++
 app/services/metrics/archives/verification.rb | 42 +++++++++++
 app/services/points/raw_data/archiver.rb      | 63 ++++++++++++++++
 app/services/points/raw_data/clearer.rb       | 21 ++++++
 app/services/points/raw_data/restorer.rb      | 34 ++++++++-
 app/services/points/raw_data/verifier.rb      | 65 ++++++++++++++++
 .../archives/compression_ratio_spec.rb        | 51 +++++++++++++
 .../metrics/archives/count_mismatch_spec.rb   | 74 ++++++++++++++++++
 .../metrics/archives/operation_spec.rb        | 63 ++++++++++++++++
 .../metrics/archives/points_archived_spec.rb  | 61 +++++++++++++++
 spec/services/metrics/archives/size_spec.rb   | 51 +++++++++++++
 .../metrics/archives/verification_spec.rb     | 75 +++++++++++++++++++
 16 files changed, 744 insertions(+), 4 deletions(-)
 create mode 100644 app/services/metrics/archives/compression_ratio.rb
 create mode 100644 app/services/metrics/archives/count_mismatch.rb
 create mode 100644 app/services/metrics/archives/operation.rb
 create mode 100644 app/services/metrics/archives/points_archived.rb
 create mode 100644 app/services/metrics/archives/size.rb
 create mode 100644 app/services/metrics/archives/verification.rb
 create mode 100644 spec/services/metrics/archives/compression_ratio_spec.rb
 create mode 100644 spec/services/metrics/archives/count_mismatch_spec.rb
 create mode 100644 spec/services/metrics/archives/operation_spec.rb
 create mode 100644 spec/services/metrics/archives/points_archived_spec.rb
 create mode 100644 spec/services/metrics/archives/size_spec.rb
 create mode 100644 spec/services/metrics/archives/verification_spec.rb

diff --git a/app/services/metrics/archives/compression_ratio.rb b/app/services/metrics/archives/compression_ratio.rb
new file mode 100644
index 00000000..2aaf6d56
--- /dev/null
+++ b/app/services/metrics/archives/compression_ratio.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class Metrics::Archives::CompressionRatio
+  def initialize(original_size:, compressed_size:)
+    @ratio = compressed_size.to_f / original_size.to_f
+  end
+
+  def call
+    return unless DawarichSettings.prometheus_exporter_enabled?
+
+    metric_data = {
+      type: 'histogram',
+      name: 'dawarich_archive_compression_ratio',
+      value: @ratio,
+      buckets: [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0]
+    }
+
+    PrometheusExporter::Client.default.send_json(metric_data)
+  rescue StandardError => e
+    Rails.logger.error("Failed to send compression ratio metric: #{e.message}")
+  end
+end
diff --git a/app/services/metrics/archives/count_mismatch.rb b/app/services/metrics/archives/count_mismatch.rb
new file mode 100644
index 00000000..a08b2f57
--- /dev/null
+++ b/app/services/metrics/archives/count_mismatch.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+class Metrics::Archives::CountMismatch
+  def initialize(user_id:, year:, month:, expected:, actual:)
+    @user_id = user_id
+    @year = year
+    @month = month
+    @expected = expected
+    @actual = actual
+  end
+
+  def call
+    return unless DawarichSettings.prometheus_exporter_enabled?
+
+    # Counter for critical errors
+    counter_data = {
+      type: 'counter',
+      name: 'dawarich_archive_count_mismatches_total',
+      value: 1,
+      labels: {
+        year: @year.to_s,
+        month: @month.to_s
+      }
+    }
+
+    PrometheusExporter::Client.default.send_json(counter_data)
+
+    # Gauge showing the difference
+    gauge_data = {
+      type: 'gauge',
+      name: 'dawarich_archive_count_difference',
+      value: (@expected - @actual).abs,
+      labels: {
+        user_id: @user_id.to_s
+      }
+    }
+
+    PrometheusExporter::Client.default.send_json(gauge_data)
+  rescue StandardError => e
+    Rails.logger.error("Failed to send count mismatch metric: #{e.message}")
+  end
+end
diff --git a/app/services/metrics/archives/operation.rb b/app/services/metrics/archives/operation.rb
new file mode 100644
index 00000000..fff86749
--- /dev/null
+++ b/app/services/metrics/archives/operation.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+class Metrics::Archives::Operation
+  OPERATIONS = %w[archive verify clear restore].freeze
+
+  def initialize(operation:, status:, user_id: nil, points_count: 0)
+    @operation = operation
+    @status = status  # 'success' or 'failure'
+    @user_id = user_id
+    @points_count = points_count
+  end
+
+  def call
+    return unless DawarichSettings.prometheus_exporter_enabled?
+
+    metric_data = {
+      type: 'counter',
+      name: 'dawarich_archive_operations_total',
+      value: 1,
+      labels: {
+        operation: @operation,
+        status: @status
+      }
+    }
+
+    PrometheusExporter::Client.default.send_json(metric_data)
+  rescue StandardError => e
+    Rails.logger.error("Failed to send archive operation metric: #{e.message}")
+  end
+end
diff --git a/app/services/metrics/archives/points_archived.rb b/app/services/metrics/archives/points_archived.rb
new file mode 100644
index 00000000..5e95746f
--- /dev/null
+++ b/app/services/metrics/archives/points_archived.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class Metrics::Archives::PointsArchived
+  def initialize(count:, operation:)
+    @count = count
+    @operation = operation  # 'added' or 'removed'
+  end
+
+  def call
+    return unless DawarichSettings.prometheus_exporter_enabled?
+
+    metric_data = {
+      type: 'counter',
+      name: 'dawarich_archive_points_total',
+      value: @count,
+      labels: {
+        operation: @operation
+      }
+    }
+
+    PrometheusExporter::Client.default.send_json(metric_data)
+  rescue StandardError => e
+    Rails.logger.error("Failed to send points archived metric: #{e.message}")
+  end
+end
diff --git a/app/services/metrics/archives/size.rb b/app/services/metrics/archives/size.rb
new file mode 100644
index 00000000..4b4a5cd9
--- /dev/null
+++ b/app/services/metrics/archives/size.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class Metrics::Archives::Size
+  def initialize(size_bytes:)
+    @size_bytes = size_bytes
+  end
+
+  def call
+    return unless DawarichSettings.prometheus_exporter_enabled?
+
+    metric_data = {
+      type: 'histogram',
+      name: 'dawarich_archive_size_bytes',
+      value: @size_bytes,
+      buckets: [
+        1_000_000,      # 1 MB
+        10_000_000,     # 10 MB
+        50_000_000,     # 50 MB
+        100_000_000,    # 100 MB
+        500_000_000,    # 500 MB
+        1_000_000_000   # 1 GB
+      ]
+    }
+
+    PrometheusExporter::Client.default.send_json(metric_data)
+  rescue StandardError => e
+    Rails.logger.error("Failed to send archive size metric: #{e.message}")
+  end
+end
diff --git a/app/services/metrics/archives/verification.rb b/app/services/metrics/archives/verification.rb
new file mode 100644
index 00000000..deb07889
--- /dev/null
+++ b/app/services/metrics/archives/verification.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+class Metrics::Archives::Verification
+  def initialize(duration_seconds:, status:, check_name: nil)
+    @duration_seconds = duration_seconds
+    @status = status
+    @check_name = check_name
+  end
+
+  def call
+    return unless DawarichSettings.prometheus_exporter_enabled?
+
+    # Duration histogram
+    histogram_data = {
+      type: 'histogram',
+      name: 'dawarich_archive_verification_duration_seconds',
+      value: @duration_seconds,
+      labels: {
+        status: @status
+      },
+      buckets: [0.1, 0.5, 1, 2, 5, 10, 30, 60]
+    }
+
+    PrometheusExporter::Client.default.send_json(histogram_data)
+
+    # Failed check counter (if failure)
+    if @status == 'failure' && @check_name
+      counter_data = {
+        type: 'counter',
+        name: 'dawarich_archive_verification_failures_total',
+        value: 1,
+        labels: {
+          check: @check_name  # e.g., 'count_mismatch', 'checksum_mismatch'
+        }
+      }
+
+      PrometheusExporter::Client.default.send_json(counter_data)
+    end
+  rescue StandardError => e
+    Rails.logger.error("Failed to send verification metric: #{e.message}")
+  end
+end
diff --git a/app/services/points/raw_data/archiver.rb b/app/services/points/raw_data/archiver.rb
index 53d439e6..29a96be3 100644
--- a/app/services/points/raw_data/archiver.rb
+++ b/app/services/points/raw_data/archiver.rb
@@ -79,6 +79,14 @@ module Points
         lock_acquired = ActiveRecord::Base.with_advisory_lock(lock_key, timeout_seconds: 0) do
           archive_month(user_id, year, month)
           @stats[:processed] += 1
+
+          # Report successful archive operation
+          Metrics::Archives::Operation.new(
+            operation: 'archive',
+            status: 'success',
+            user_id: user_id
+          ).call
+
           true
         end
 
@@ -87,6 +95,13 @@ module Points
         ExceptionReporter.call(e, "Failed to archive points for user #{user_id}, #{year}-#{month}")
 
         @stats[:failed] += 1
+
+        # Report failed archive operation
+        Metrics::Archives::Operation.new(
+          operation: 'archive',
+          status: 'failure',
+          user_id: user_id
+        ).call
       end
 
       def archive_month(user_id, year, month)
@@ -109,6 +124,12 @@ module Points
         mark_points_as_archived(point_ids, archive.id)
         update_stats(point_ids.count)
         log_archival_success(archive)
+
+        # Report points archived
+        Metrics::Archives::PointsArchived.new(
+          count: point_ids.count,
+          operation: 'added'
+        ).call
       end
 
       def find_archivable_points(user_id, year, month)
@@ -161,6 +182,15 @@ module Points
         # Validate count: critical data integrity check
         expected_count = point_ids.count
         if actual_count != expected_count
+          # Report count mismatch to metrics
+          Metrics::Archives::CountMismatch.new(
+            user_id: user_id,
+            year: year,
+            month: month,
+            expected: expected_count,
+            actual: actual_count
+          ).call
+
           error_msg = "Archive count mismatch for user #{user_id} #{year}-#{format('%02d', month)}: " \
                       "expected #{expected_count} points, but only #{actual_count} were compressed"
           Rails.logger.error(error_msg)
@@ -198,6 +228,21 @@ module Points
           key: "raw_data_archives/#{user_id}/#{year}/#{format('%02d', month)}/#{format('%03d', chunk_number)}.jsonl.gz"
         )
 
+        # Report archive size
+        if archive.file.attached?
+          Metrics::Archives::Size.new(
+            size_bytes: archive.file.blob.byte_size
+          ).call
+
+          # Report compression ratio (estimate original size from JSON)
+          # Rough estimate: each point as JSON ~100-200 bytes
+          estimated_original_size = actual_count * 150
+          Metrics::Archives::CompressionRatio.new(
+            original_size: estimated_original_size,
+            compressed_size: archive.file.blob.byte_size
+          ).call
+        end
+
         archive
       end
 
@@ -208,9 +253,11 @@ module Points
       def verify_archive_immediately(archive, expected_point_ids)
         # Lightweight verification immediately after archiving
         # Ensures archive is valid before marking points as archived
+        start_time = Time.current
 
         # 1. Verify file is attached
         unless archive.file.attached?
+          report_verification_metric(start_time, 'failure', 'file_not_attached')
           return { success: false, error: 'File not attached' }
         end
 
@@ -218,11 +265,13 @@ module Points
         begin
           compressed_content = archive.file.blob.download
         rescue StandardError => e
+          report_verification_metric(start_time, 'failure', 'download_failed')
           return { success: false, error: "File download failed: #{e.message}" }
         end
 
         # 3. Verify file size is reasonable
         if compressed_content.bytesize.zero?
+          report_verification_metric(start_time, 'failure', 'empty_file')
           return { success: false, error: 'File is empty' }
         end
 
@@ -239,11 +288,13 @@ module Points
 
           gz.close
         rescue StandardError => e
+          report_verification_metric(start_time, 'failure', 'decompression_failed')
           return { success: false, error: "Decompression/parsing failed: #{e.message}" }
         end
 
         # 5. Verify point count matches
         if archived_point_ids.count != expected_point_ids.count
+          report_verification_metric(start_time, 'failure', 'count_mismatch')
           return {
             success: false,
             error: "Point count mismatch in archive: expected #{expected_point_ids.count}, found #{archived_point_ids.count}"
@@ -254,12 +305,24 @@ module Points
         archived_checksum = calculate_checksum(archived_point_ids)
         expected_checksum = calculate_checksum(expected_point_ids)
         if archived_checksum != expected_checksum
+          report_verification_metric(start_time, 'failure', 'checksum_mismatch')
           return { success: false, error: 'Point IDs checksum mismatch in archive' }
         end
 
         Rails.logger.info("✓ Immediate verification passed for archive #{archive.id}")
+        report_verification_metric(start_time, 'success')
         { success: true }
       end
+
+      def report_verification_metric(start_time, status, check_name = nil)
+        duration = Time.current - start_time
+
+        Metrics::Archives::Verification.new(
+          duration_seconds: duration,
+          status: status,
+          check_name: check_name
+        ).call
+      end
     end
   end
 end
diff --git a/app/services/points/raw_data/clearer.rb b/app/services/points/raw_data/clearer.rb
index 46187824..444be714 100644
--- a/app/services/points/raw_data/clearer.rb
+++ b/app/services/points/raw_data/clearer.rb
@@ -74,9 +74,30 @@ module Points
         cleared_count = clear_points_in_batches(point_ids)
         @stats[:cleared] += cleared_count
         Rails.logger.info("✓ Cleared #{cleared_count} points for archive #{archive.id}")
+
+        # Report successful clear operation
+        Metrics::Archives::Operation.new(
+          operation: 'clear',
+          status: 'success',
+          user_id: archive.user_id,
+          points_count: cleared_count
+        ).call
+
+        # Report points removed (cleared from database)
+        Metrics::Archives::PointsArchived.new(
+          count: cleared_count,
+          operation: 'removed'
+        ).call
       rescue StandardError => e
         ExceptionReporter.call(e, "Failed to clear points for archive #{archive.id}")
         Rails.logger.error("✗ Failed to clear archive #{archive.id}: #{e.message}")
+
+        # Report failed clear operation
+        Metrics::Archives::Operation.new(
+          operation: 'clear',
+          status: 'failure',
+          user_id: archive.user_id
+        ).call
       end
 
       def clear_points_in_batches(point_ids)
diff --git a/app/services/points/raw_data/restorer.rb b/app/services/points/raw_data/restorer.rb
index 004f7185..aba0da66 100644
--- a/app/services/points/raw_data/restorer.rb
+++ b/app/services/points/raw_data/restorer.rb
@@ -9,12 +9,38 @@ module Points
         raise "No archives found for user #{user_id}, #{year}-#{month}" if archives.empty?
 
         Rails.logger.info("Restoring #{archives.count} archives to database...")
+        total_points = archives.sum(:point_count)
 
-        Point.transaction do
-          archives.each { restore_archive_to_db(_1) }
+        begin
+          Point.transaction do
+            archives.each { restore_archive_to_db(_1) }
+          end
+
+          Rails.logger.info("✓ Restored #{total_points} points")
+
+          # Report successful restore operation
+          Metrics::Archives::Operation.new(
+            operation: 'restore',
+            status: 'success',
+            user_id: user_id,
+            points_count: total_points
+          ).call
+
+          # Report points restored (removed from archived state)
+          Metrics::Archives::PointsArchived.new(
+            count: total_points,
+            operation: 'removed'
+          ).call
+        rescue StandardError => e
+          # Report failed restore operation
+          Metrics::Archives::Operation.new(
+            operation: 'restore',
+            status: 'failure',
+            user_id: user_id
+          ).call
+
+          raise
         end
-
-        Rails.logger.info("✓ Restored #{archives.sum(:point_count)} points")
       end
 
       def restore_to_memory(user_id, year, month)
diff --git a/app/services/points/raw_data/verifier.rb b/app/services/points/raw_data/verifier.rb
index 2da7dfc2..63474c93 100644
--- a/app/services/points/raw_data/verifier.rb
+++ b/app/services/points/raw_data/verifier.rb
@@ -40,6 +40,7 @@ module Points
 
       def verify_archive(archive)
         Rails.logger.info("Verifying archive #{archive.id} (#{archive.month_display}, chunk #{archive.chunk_number})...")
+        start_time = Time.current
 
         verification_result = perform_verification(archive)
 
@@ -47,6 +48,16 @@ module Points
           archive.update!(verified_at: Time.current)
           @stats[:verified] += 1
           Rails.logger.info("✓ Archive #{archive.id} verified successfully")
+
+          # Report successful verification operation
+          Metrics::Archives::Operation.new(
+            operation: 'verify',
+            status: 'success',
+            user_id: archive.user_id
+          ).call
+
+          # Report verification duration
+          report_verification_metric(start_time, 'success')
         else
           @stats[:failed] += 1
           Rails.logger.error("✗ Archive #{archive.id} verification failed: #{verification_result[:error]}")
@@ -54,11 +65,32 @@ module Points
             StandardError.new(verification_result[:error]),
             "Archive verification failed for archive #{archive.id}"
           )
+
+          # Report failed verification operation
+          Metrics::Archives::Operation.new(
+            operation: 'verify',
+            status: 'failure',
+            user_id: archive.user_id
+          ).call
+
+          # Report verification duration with check name
+          check_name = extract_check_name_from_error(verification_result[:error])
+          report_verification_metric(start_time, 'failure', check_name)
         end
       rescue StandardError => e
         @stats[:failed] += 1
         ExceptionReporter.call(e, "Failed to verify archive #{archive.id}")
         Rails.logger.error("✗ Archive #{archive.id} verification error: #{e.message}")
+
+        # Report failed verification operation
+        Metrics::Archives::Operation.new(
+          operation: 'verify',
+          status: 'failure',
+          user_id: archive.user_id
+        ).call
+
+        # Report verification duration
+        report_verification_metric(start_time, 'failure', 'exception')
       end
 
       def perform_verification(archive)
@@ -194,6 +226,39 @@ module Points
       def calculate_checksum(point_ids)
         Digest::SHA256.hexdigest(point_ids.sort.join(','))
       end
+
+      def report_verification_metric(start_time, status, check_name = nil)
+        duration = Time.current - start_time
+
+        Metrics::Archives::Verification.new(
+          duration_seconds: duration,
+          status: status,
+          check_name: check_name
+        ).call
+      end
+
+      def extract_check_name_from_error(error_message)
+        case error_message
+        when /File not attached/i
+          'file_not_attached'
+        when /File download failed/i
+          'download_failed'
+        when /File is empty/i
+          'empty_file'
+        when /MD5 checksum mismatch/i
+          'md5_checksum_mismatch'
+        when /Decompression\/parsing failed/i
+          'decompression_failed'
+        when /Point count mismatch/i
+          'count_mismatch'
+        when /Point IDs checksum mismatch/i
+          'checksum_mismatch'
+        when /Raw data mismatch/i
+          'raw_data_mismatch'
+        else
+          'unknown'
+        end
+      end
     end
   end
 end
diff --git a/spec/services/metrics/archives/compression_ratio_spec.rb b/spec/services/metrics/archives/compression_ratio_spec.rb
new file mode 100644
index 00000000..7ddd7730
--- /dev/null
+++ b/spec/services/metrics/archives/compression_ratio_spec.rb
@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+require 'prometheus_exporter/client'
+
+RSpec.describe Metrics::Archives::CompressionRatio do
+  describe '#call' do
+    subject(:compression_ratio) do
+      described_class.new(
+        original_size: original_size,
+        compressed_size: compressed_size
+      ).call
+    end
+
+    let(:original_size) { 10_000 }
+    let(:compressed_size) { 3_000 }
+    let(:expected_ratio) { 0.3 }
+    let(:prometheus_client) { instance_double(PrometheusExporter::Client) }
+
+    before do
+      allow(PrometheusExporter::Client).to receive(:default).and_return(prometheus_client)
+      allow(prometheus_client).to receive(:send_json)
+      allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(true)
+    end
+
+    it 'sends compression ratio histogram metric to prometheus' do
+      expect(prometheus_client).to receive(:send_json).with(
+        {
+          type: 'histogram',
+          name: 'dawarich_archive_compression_ratio',
+          value: expected_ratio,
+          buckets: [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0]
+        }
+      )
+
+      compression_ratio
+    end
+
+    context 'when prometheus exporter is disabled' do
+      before do
+        allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(false)
+      end
+
+      it 'does not send metric' do
+        expect(prometheus_client).not_to receive(:send_json)
+
+        compression_ratio
+      end
+    end
+  end
+end
diff --git a/spec/services/metrics/archives/count_mismatch_spec.rb b/spec/services/metrics/archives/count_mismatch_spec.rb
new file mode 100644
index 00000000..c482228a
--- /dev/null
+++ b/spec/services/metrics/archives/count_mismatch_spec.rb
@@ -0,0 +1,74 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+require 'prometheus_exporter/client'
+
+RSpec.describe Metrics::Archives::CountMismatch do
+  describe '#call' do
+    subject(:count_mismatch) do
+      described_class.new(
+        user_id: user_id,
+        year: year,
+        month: month,
+        expected: expected,
+        actual: actual
+      ).call
+    end
+
+    let(:user_id) { 123 }
+    let(:year) { 2025 }
+    let(:month) { 1 }
+    let(:expected) { 100 }
+    let(:actual) { 95 }
+    let(:prometheus_client) { instance_double(PrometheusExporter::Client) }
+
+    before do
+      allow(PrometheusExporter::Client).to receive(:default).and_return(prometheus_client)
+      allow(prometheus_client).to receive(:send_json)
+      allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(true)
+    end
+
+    it 'sends count mismatch counter metric' do
+      expect(prometheus_client).to receive(:send_json).with(
+        {
+          type: 'counter',
+          name: 'dawarich_archive_count_mismatches_total',
+          value: 1,
+          labels: {
+            year: year.to_s,
+            month: month.to_s
+          }
+        }
+      )
+
+      count_mismatch
+    end
+
+    it 'sends count difference gauge metric' do
+      expect(prometheus_client).to receive(:send_json).with(
+        {
+          type: 'gauge',
+          name: 'dawarich_archive_count_difference',
+          value: 5,
+          labels: {
+            user_id: user_id.to_s
+          }
+        }
+      )
+
+      count_mismatch
+    end
+
+    context 'when prometheus exporter is disabled' do
+      before do
+        allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(false)
+      end
+
+      it 'does not send metrics' do
+        expect(prometheus_client).not_to receive(:send_json)
+
+        count_mismatch
+      end
+    end
+  end
+end
diff --git a/spec/services/metrics/archives/operation_spec.rb b/spec/services/metrics/archives/operation_spec.rb
new file mode 100644
index 00000000..3e227d1a
--- /dev/null
+++ b/spec/services/metrics/archives/operation_spec.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+require 'prometheus_exporter/client'
+
+RSpec.describe Metrics::Archives::Operation do
+  describe '#call' do
+    subject(:operation) { described_class.new(operation: operation_type, status: status, user_id: user_id).call }
+
+    let(:user_id) { 123 }
+    let(:operation_type) { 'archive' }
+    let(:status) { 'success' }
+    let(:prometheus_client) { instance_double(PrometheusExporter::Client) }
+
+    before do
+      allow(PrometheusExporter::Client).to receive(:default).and_return(prometheus_client)
+      allow(prometheus_client).to receive(:send_json)
+      allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(true)
+    end
+
+    it 'sends operation metric to prometheus' do
+      expect(prometheus_client).to receive(:send_json).with(
+        {
+          type: 'counter',
+          name: 'dawarich_archive_operations_total',
+          value: 1,
+          labels: {
+            operation: operation_type,
+            status: status
+          }
+        }
+      )
+
+      operation
+    end
+
+    context 'when prometheus exporter is disabled' do
+      before do
+        allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(false)
+      end
+
+      it 'does not send metric' do
+        expect(prometheus_client).not_to receive(:send_json)
+
+        operation
+      end
+    end
+
+    context 'when operation fails' do
+      let(:status) { 'failure' }
+
+      it 'sends failure metric' do
+        expect(prometheus_client).to receive(:send_json).with(
+          hash_including(
+            labels: hash_including(status: 'failure')
+          )
+        )
+
+        operation
+      end
+    end
+  end
+end
diff --git a/spec/services/metrics/archives/points_archived_spec.rb b/spec/services/metrics/archives/points_archived_spec.rb
new file mode 100644
index 00000000..4171b3d2
--- /dev/null
+++ b/spec/services/metrics/archives/points_archived_spec.rb
@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+require 'prometheus_exporter/client'
+
+RSpec.describe Metrics::Archives::PointsArchived do
+  describe '#call' do
+    subject(:points_archived) { described_class.new(count: count, operation: operation).call }
+
+    let(:count) { 250 }
+    let(:operation) { 'added' }
+    let(:prometheus_client) { instance_double(PrometheusExporter::Client) }
+
+    before do
+      allow(PrometheusExporter::Client).to receive(:default).and_return(prometheus_client)
+      allow(prometheus_client).to receive(:send_json)
+      allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(true)
+    end
+
+    it 'sends points archived metric to prometheus' do
+      expect(prometheus_client).to receive(:send_json).with(
+        {
+          type: 'counter',
+          name: 'dawarich_archive_points_total',
+          value: count,
+          labels: {
+            operation: operation
+          }
+        }
+      )
+
+      points_archived
+    end
+
+    context 'when operation is removed' do
+      let(:operation) { 'removed' }
+
+      it 'sends removed operation metric' do
+        expect(prometheus_client).to receive(:send_json).with(
+          hash_including(
+            labels: { operation: 'removed' }
+          )
+        )
+
+        points_archived
+      end
+    end
+
+    context 'when prometheus exporter is disabled' do
+      before do
+        allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(false)
+      end
+
+      it 'does not send metric' do
+        expect(prometheus_client).not_to receive(:send_json)
+
+        points_archived
+      end
+    end
+  end
+end
diff --git a/spec/services/metrics/archives/size_spec.rb b/spec/services/metrics/archives/size_spec.rb
new file mode 100644
index 00000000..60a8b320
--- /dev/null
+++ b/spec/services/metrics/archives/size_spec.rb
@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+require 'prometheus_exporter/client'
+
+RSpec.describe Metrics::Archives::Size do
+  describe '#call' do
+    subject(:size) { described_class.new(size_bytes: size_bytes).call }
+
+    let(:size_bytes) { 5_000_000 }
+    let(:prometheus_client) { instance_double(PrometheusExporter::Client) }
+
+    before do
+      allow(PrometheusExporter::Client).to receive(:default).and_return(prometheus_client)
+      allow(prometheus_client).to receive(:send_json)
+      allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(true)
+    end
+
+    it 'sends archive size histogram metric to prometheus' do
+      expect(prometheus_client).to receive(:send_json).with(
+        {
+          type: 'histogram',
+          name: 'dawarich_archive_size_bytes',
+          value: size_bytes,
+          buckets: [
+            1_000_000,
+            10_000_000,
+            50_000_000,
+            100_000_000,
+            500_000_000,
+            1_000_000_000
+          ]
+        }
+      )
+
+      size
+    end
+
+    context 'when prometheus exporter is disabled' do
+      before do
+        allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(false)
+      end
+
+      it 'does not send metric' do
+        expect(prometheus_client).not_to receive(:send_json)
+
+        size
+      end
+    end
+  end
+end
diff --git a/spec/services/metrics/archives/verification_spec.rb b/spec/services/metrics/archives/verification_spec.rb
new file mode 100644
index 00000000..d3323e68
--- /dev/null
+++ b/spec/services/metrics/archives/verification_spec.rb
@@ -0,0 +1,75 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+require 'prometheus_exporter/client'
+
+RSpec.describe Metrics::Archives::Verification do
+  describe '#call' do
+    subject(:verification) do
+      described_class.new(
+        duration_seconds: duration_seconds,
+        status: status,
+        check_name: check_name
+      ).call
+    end
+
+    let(:duration_seconds) { 2.5 }
+    let(:status) { 'success' }
+    let(:check_name) { nil }
+    let(:prometheus_client) { instance_double(PrometheusExporter::Client) }
+
+    before do
+      allow(PrometheusExporter::Client).to receive(:default).and_return(prometheus_client)
+      allow(prometheus_client).to receive(:send_json)
+      allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(true)
+    end
+
+    it 'sends verification duration histogram metric' do
+      expect(prometheus_client).to receive(:send_json).with(
+        {
+          type: 'histogram',
+          name: 'dawarich_archive_verification_duration_seconds',
+          value: duration_seconds,
+          labels: {
+            status: status
+          },
+          buckets: [0.1, 0.5, 1, 2, 5, 10, 30, 60]
+        }
+      )
+
+      verification
+    end
+
+    context 'when verification fails with check name' do
+      let(:status) { 'failure' }
+      let(:check_name) { 'count_mismatch' }
+
+      it 'sends verification failure counter metric' do
+        expect(prometheus_client).to receive(:send_json).with(
+          hash_including(
+            type: 'counter',
+            name: 'dawarich_archive_verification_failures_total',
+            value: 1,
+            labels: {
+              check: check_name
+            }
+          )
+        )
+
+        verification
+      end
+    end
+
+    context 'when prometheus exporter is disabled' do
+      before do
+        allow(DawarichSettings).to receive(:prometheus_exporter_enabled?).and_return(false)
+      end
+
+      it 'does not send metrics' do
+        expect(prometheus_client).not_to receive(:send_json)
+
+        verification
+      end
+    end
+  end
+end