[PATCH] sql: Add a couple of indexes.

[Christopher Baines]

Remove the Builds_index from the schema, as it would have been removed in
error by the upgrade-6 upgrade.  Add a specific index on the Builds status
field, as this helps with db-get-builds queries, and add an index on the
Outputs derivation field, as this helps with the db-get-outputs part of
db-get-builds.

* src/sql/upgrade-7.sql: New file.
* src/schema.sql: Update accordingly.
---
 src/schema.sql        | 3 ++-
 src/sql/upgrade-7.sql | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 src/sql/upgrade-7.sql

diff --git a/src/schema.sql b/src/schema.sql
index 1104551..60d250a 100644
--- a/src/schema.sql
+++ b/src/schema.sql
@@ -74,7 +74,8 @@ CREATE TABLE Events (
 
 -- Create indexes to speed up common queries, in particular those
 -- corresponding to /api/latestbuilds and /api/queue HTTP requests.
-CREATE INDEX Builds_index ON Builds(job_name, system, status ASC, timestamp 
ASC, derivation, evaluation, stoptime DESC);
+CREATE INDEX Builds_status_index ON Builds (status);
+CREATE INDEX Outputs_derivation_index ON Outputs (derivation);
 CREATE INDEX Inputs_index ON Inputs(specification, name, branch);
 
 COMMIT;
diff --git a/src/sql/upgrade-7.sql b/src/sql/upgrade-7.sql
new file mode 100644
index 0000000..1be3470
--- /dev/null
+++ b/src/sql/upgrade-7.sql
@@ -0,0 +1,7 @@
+BEGIN TRANSACTION;
+
+CREATE INDEX Builds_status_index ON Builds (status);
+
+CREATE INDEX Outputs_derivation_index ON Outputs (derivation);
+
+COMMIT;
-- 
2.26.2