02/03: Add an index on git_commits

[Christopher Baines]

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

commit d19eb07138c5820f4c2fa1a71b7fb499acf39e4d
Author: Christopher Baines <mail@cbaines.net>
AuthorDate: Fri Jun 17 12:54:43 2022 +0100

    Add an index on git_commits
    
    And also remove the duplicates that have crept in.
---
 sqitch/deploy/fix_git_commits_duplicates.sql | 18 ++++++++++++++++++
 sqitch/revert/fix_git_commits_duplicates.sql |  7 +++++++
 sqitch/sqitch.plan                           |  1 +
 sqitch/verify/fix_git_commits_duplicates.sql |  7 +++++++
 4 files changed, 33 insertions(+)

diff --git a/sqitch/deploy/fix_git_commits_duplicates.sql 
b/sqitch/deploy/fix_git_commits_duplicates.sql
new file mode 100644
index 0000000..daf1213
--- /dev/null
+++ b/sqitch/deploy/fix_git_commits_duplicates.sql
@@ -0,0 +1,18 @@
+-- Deploy guix-data-service:fix_git_commits_duplicates to pg
+
+BEGIN;
+
+DELETE FROM git_commits WHERE id IN (
+  SELECT DISTINCT b.id
+  FROM git_commits AS a
+  INNER JOIN git_commits AS b
+  ON a.commit = b.commit AND
+     a.git_branch_id = b.git_branch_id AND
+     a.datetime = b.datetime AND
+     a.id != b.id
+  WHERE a.id < b.id
+);
+
+CREATE UNIQUE INDEX git_commits_unique_idx ON git_commits (git_branch_id, 
commit, datetime);
+
+COMMIT;
diff --git a/sqitch/revert/fix_git_commits_duplicates.sql 
b/sqitch/revert/fix_git_commits_duplicates.sql
new file mode 100644
index 0000000..d80d9ef
--- /dev/null
+++ b/sqitch/revert/fix_git_commits_duplicates.sql
@@ -0,0 +1,7 @@
+-- Revert guix-data-service:fix_git_commits_duplicates from pg
+
+BEGIN;
+
+-- XXX Add DDLs here.
+
+COMMIT;
diff --git a/sqitch/sqitch.plan b/sqitch/sqitch.plan
index f71fcbe..6c6e2f1 100644
--- a/sqitch/sqitch.plan
+++ b/sqitch/sqitch.plan
@@ -86,3 +86,4 @@ package_derivations_not_null_hash_index 2021-07-11T14:19:32Z 
Christopher Baines
 git_branch_id 2022-05-23T18:11:14Z Chris <chris@felis> # Add git_branch.id
 partition_package_derivations_by_guix_revision_range 2022-05-23T18:20:37Z 
Chris <chris@felis> # Partition package_derivations_by_guix_revision_range
 package_range_index 2022-06-17T10:39:31Z Chris <chris@felis> # Add index on 
package_derivations_by_guix_revision_range.package_name
+fix_git_commits_duplicates 2022-06-17T10:39:50Z Chris <chris@felis> # Fix 
git_commits duplicates
diff --git a/sqitch/verify/fix_git_commits_duplicates.sql 
b/sqitch/verify/fix_git_commits_duplicates.sql
new file mode 100644
index 0000000..b8fbf2c
--- /dev/null
+++ b/sqitch/verify/fix_git_commits_duplicates.sql
@@ -0,0 +1,7 @@
+-- Verify guix-data-service:fix_git_commits_duplicates on pg
+
+BEGIN;
+
+-- XXX Add verifications here.
+
+ROLLBACK;