Fix the Darcs schema upgrade

Dependencies

• [2] Q5HZWFCY Add support for darcs repositories.
• [3] JD7AWXQG Remove now-unused SystemTypes table
• [4] KN3VYE5P * Cleaned up the foreign key constraints.
• [5] 2JGYLIEC Speed up the listing of jobset evals by caching some info in the DB
• [6] TM6C352U Ensure that stoptime and starttime are set for finished builds
• [7] FANTYCR7 Materialize the number of finished builds
• [8] P57OYJ4P Index builds on stop time
• [9] YTIDBFGU Drop unused "disabled" columns
• [10] KJQWSRCC Speed up hydra-update-gc-roots
• [11] MOX7XJ2E Merge the BuildSchedulingInfo table into the Builds table
• [12] E7FID72S Remove the BuildMachines and BuildMachinesSystemTypes tables
• [13] QLOLZHRX Allow a per-jobset check interval
• [14] RJNMYHJF Add missing file
• [15] FTPCV25M Store aggregate members in the database
• [16] RXVJFQ5A Evaluator cleanups
• [17] FV2M6MOT hydra: use autoconf/-make
• [18] 4HPT4SDD Revert "Remove now-unused SystemTypes table"
• [19] E7M2WP7A Remove unused Jobs columns
• [20] EJ7C77C3 Allow searching for store and drv paths. Only does a complete match to reduce load on database.
• [21] 2NGV7NYN Drop unused "tag" column
• [22] PHJF4FUT Add missing files
• [23] G2T4WAHI Store the inputs of each evaluation in the database
• [24] D5QIOJGP * Move everything up one directory.
• [25] H7HGWODE * Remove an empty file.
• [26] PCKLFRT5 Support push notification of repository changes

Change contents

• file move: upgrade-darcs.sql (----------) → upgrade-20.sql (----------)
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  [2.5184]