FEATURE: start tracking information about migrations that run

This commit adds a new tracking table that lets us know

- When a migration ran
- What version Discourse was at
- How long it took
- What version Rails was at

The built in tracking in Rails is very limited, does not track this info

lib/freedom_patches/schema_migration_details.rb

@@ -0,0 +1,54 @@
+module FreedomPatches
+  module SchemaMigrationDetails
+    def exec_migration(conn, direction)
+      rval = nil
+
+      time = Benchmark.measure do
+        rval=super
+      end
+
+      sql = <<SQL
+      INSERT INTO schema_migration_details(
+        version,
+        hostname,
+        name,
+        git_version,
+        duration,
+        direction,
+        rails_version,
+        created_at
+      ) values (
+        :version,
+        :hostname,
+        :name,
+        :git_version,
+        :duration,
+        :direction,
+        :rails_version,
+        :created_at
+      )
+SQL
+
+      hostname = `hostname` rescue ""
+      sql = ActiveRecord::Base.send(:sanitize_sql_array, [sql, {
+        version: version || "",
+        duration: (time.real * 1000).to_i,
+        hostname: hostname,
+        name: name,
+        git_version: Discourse.git_version,
+        created_at: Time.zone.now,
+        direction: direction.to_s,
+        rails_version: Rails.version
+      }])
+
+      conn.execute(sql)
+
+      rval
+    end
+
+  end
+end
+
+class ActiveRecord::Migration
+  prepend FreedomPatches::SchemaMigrationDetails
+end