branch master updated (d844b32 -> 5465441)

[Christopher Baines]

cbaines pushed a change to branch master
in repository data-service.

    from d844b32  Stop recursing now that derivation deletion selection is 
smarter
     new 3330f03  Remove a now redundant part of the maybe-delete-derivation 
query
     new 614f988  Add some utilities to use PostgreSQL/Squee through a channel
     new fb4c7ec  Delete derivations through a channel
     new 16600b1  Remove the deleting derivations progress output
     new 5465441  Delete derivations in parallel

The 5 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "add" were already present in the repository and have only
been added to this reference.


Summary of changes:
 guix-data-service/data-deletion.scm |  58 +++++++++-----------
 guix-data-service/database.scm      | 102 ++++++++++++++++++++++++++++++++++++
 2 files changed, 126 insertions(+), 34 deletions(-)