Lower log clear threshhold

config/config.exs

@@ -11,13 +11,9 @@ config :logger, [
   backends: [:console]
 ]
 
-# Randomly picked 300 megabytes.
-# 3964928 bytes == ~4 megabytes in sqlite3
-# 9266 logs = ~4 megabytes
-# 4 logs * 75 = 300 megabytes
-# 9266 logs * 75 = 694950 logs
-# This will trim 175000 logs (25%) every time it gets to the max logs.
-config :logger_backend_ecto, max_logs: 700000
+# 700 bytes / log
+# 100,000 logs * 700 bytes ~= 70 megabytes 
+config :logger_backend_ecto, max_logs: 100000
 
 # Stop lager redirecting :error_logger messages
 config :lager, :error_logger_redirect, false

lib/farmbot/logger/logger.ex

@@ -4,6 +4,31 @@ defmodule Farmbot.Logger do
   """
   use GenStage
 
+  def how_many_logs do
+    alias IO.ANSI
+    alias LoggerBackendEcto.{Repo, Log}
+    import Ecto.Query
+
+    count = Repo.one(from f in Log, select: count(f.id))
+    total = Application.get_env(:logger_backend_ecto, :max_logs)
+    size_mb = File.stat!(Repo.config[:database]).size * 1.0e-6
+
+    IO.puts [
+      ANSI.clear(), ANSI.home(), ANSI.blue(), 
+      "logs: ", ANSI.green(), to_string(count), " / ", to_string(total), 
+
+      "\r\n", ANSI.blue(), 
+      "size: ", ANSI.green(), to_string(size_mb),
+
+      "\r\n", ANSI.blue(), "\r\n",
+      "prediction: ", ANSI.green(), to_string(total / count), 
+      "\r\n", ANSI.blue(),
+
+      "size: ", ANSI.green(), to_string((total / count) * size_mb),
+      "\r\n", ANSI.normal()
+    ]
+  end
+
   def format_logs do
     RingLogger.get()
     |> Enum.map(fn({level, {_logger, message, timestamp_tup, _meta}}) ->