diff --git a/manual_graph/Gemfile b/manual_graph/Gemfile
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+++ b/manual_graph/Gemfile
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+source "https://rubygems.org"
+
+gem "sequel"
+gem "pry"
+gem "pg"
+gem "sinatra"
+gem "puma"
diff --git a/manual_graph/Gemfile.lock b/manual_graph/Gemfile.lock
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+++ b/manual_graph/Gemfile.lock
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+GEM
+ remote: https://rubygems.org/
+ specs:
+ coderay (1.1.3)
+ method_source (1.0.0)
+ mustermann (1.1.1)
+ ruby2_keywords (~> 0.0.1)
+ nio4r (2.5.8)
+ pg (1.3.5)
+ pry (0.14.1)
+ coderay (~> 1.1)
+ method_source (~> 1.0)
+ puma (5.6.4)
+ nio4r (~> 2.0)
+ rack (2.2.3)
+ rack-protection (2.2.0)
+ rack
+ ruby2_keywords (0.0.5)
+ sequel (5.56.0)
+ sinatra (2.2.0)
+ mustermann (~> 1.0)
+ rack (~> 2.2)
+ rack-protection (= 2.2.0)
+ tilt (~> 2.0)
+ tilt (2.0.10)
+
+PLATFORMS
+ arm64-darwin-21
+
+DEPENDENCIES
+ pg
+ pry
+ puma
+ sequel
+ sinatra
+
+BUNDLED WITH
+ 2.3.9
diff --git a/manual_graph/README.md b/manual_graph/README.md
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+++ b/manual_graph/README.md
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+# manual graph
+
+## Running
+
+```
+export DATABASE_URL=""
+bundle exec ruby server.rb
+```
+
+```
+open index.html
+```
diff --git a/manual_graph/frontend.html b/manual_graph/frontend.html
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+++ b/manual_graph/frontend.html
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+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/manual_graph/server.rb b/manual_graph/server.rb
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+++ b/manual_graph/server.rb
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+require "json"
+require "sinatra"
+require "sequel"
+require "pry"
+
+class Server
+ def fetch(key:)
+ return cache[key] if cache.key?(key)
+
+ date = Date.new(2020, 1, 1)
+ result = {}
+ while date < Date.today - 1
+ date += 1
+ puts "fetch data for #{date}"
+ result[date] = process_date(date, key)
+ end
+ cache[key] = result
+ return result
+ end
+
+ def process_date(date, key)
+ raise "invalid key" unless key.match(/^[[:alpha:][:blank:]]+$/)
+ # Find the timestamp of the end of a given day
+ eod_timestamp = (date + 1).to_time.to_i * 1000
+
+ day_timestamp = date.to_time.to_i * 1000
+ week_timestamp = (date - 7).to_time.to_i * 1000
+ month_timestamp = (date - 30).to_time.to_i * 1000
+ quarter_timestamp = (date - 90).to_time.to_i * 1000
+ year_timestamp = (date - 365).to_time.to_i * 1000
+ all_time_timestamp = 0
+
+ query = "SELECT "
+ query += "(SELECT ROUND(AVG(value::numeric), 4) FROM raw_data WHERE timestamp > #{day_timestamp} AND timestamp <= #{eod_timestamp} AND key='#{key}') as day,"
+ query += "(SELECT ROUND(AVG(value::numeric), 4) FROM raw_data WHERE timestamp > #{week_timestamp} AND timestamp <= #{eod_timestamp} AND key='#{key}') as week,"
+ query += "(SELECT ROUND(AVG(value::numeric), 4) FROM raw_data WHERE timestamp > #{month_timestamp} AND timestamp <= #{eod_timestamp} AND key='#{key}') as month,"
+ query += "(SELECT ROUND(AVG(value::numeric), 4) FROM raw_data WHERE timestamp > #{quarter_timestamp} AND timestamp <= #{eod_timestamp} AND key='#{key}') as quarter,"
+ query += "(SELECT ROUND(AVG(value::numeric), 4) FROM raw_data WHERE timestamp > #{year_timestamp} AND timestamp <= #{eod_timestamp} AND key='#{key}') as year,"
+ query += "(SELECT ROUND(AVG(value::numeric), 4) FROM raw_data WHERE timestamp > #{all_time_timestamp} AND timestamp <= #{eod_timestamp} AND key='#{key}') as all_time"
+
+ return db[query].to_a.first.collect { |k, v| [k, v ? v.to_f : nil] }.to_h # convert BigFloat
+ end
+
+ def db
+ @_db ||= Sequel.connect(ENV.fetch("DATABASE_URL"))
+ end
+
+ def raw_data
+ @_raw_data ||= db[:raw_data]
+ end
+
+ def cache
+ @_cache ||= {}
+ end
+end
+
+
+
+# Sinatra API get request for JSON data
+server = Server.new
+get '/' do
+ content_type 'application/json'
+ response['Access-Control-Allow-Origin'] = '*'
+
+ server.fetch(key: params.fetch("key")).to_json
+end
+