Add another index to speed up the jobstatus page

Dependencies

• [2] C5W3WZ3Y * Index the Builds table on drvPath to prevent a full table scan
• [3] 5L272QSC Speed up the /jobset overview pages a lot
• [4] 2I2ZX6JB * Make the "latest succeeded" query (used by the "latest" channel)
• [5] E2TOU3L6 * More indices.
• [6] P5VJCT6U fix wrong comment
• [7] 6QRHXIM3 * Speed up the jobset index page. Especially the query to get the
• [*] N22GPKYT * Put info about logs / build products in the DB.

Change contents

• replacement in src/sql/hydra.sql at line 535
  [4.3040]→[3.84:183](∅→∅)
  − create index IndexBuildsOnJobsetFinishedTimestamp on Builds(project, jobset, finished, timestamp);
  [4.3040]

  [4.704]
  + create index IndexBuildsOnJobsetFinishedTimestamp on Builds(project, jobset, finished, timestamp DESC);
• edit in src/sql/hydra.sql at line 537
  [4.804]

  [2.0]
  + create index IndexBuildsOnJobSystemCurrent on Builds(project, jobset, job, system, isCurrent);