From 4a12b3d4a015a2327ff29a9b78769e00e10608ad Mon Sep 17 00:00:00 2001
From: Thomas Churchman <thomas@kepow.org>
Date: Thu, 21 Mar 2024 21:50:35 +0100
Subject: [PATCH] feat: add created_at and updated_at timestamps to
 kit_configurations, kits, and users

---
 .../down.sql                                  | 19 +++++
 .../up.sql                                    | 81 +++++++++++++++++++
 2 files changed, 100 insertions(+)
 create mode 100644 migrations/2024-03-21-163750_add-kit-configurations-kits-users-timestamps/down.sql
 create mode 100644 migrations/2024-03-21-163750_add-kit-configurations-kits-users-timestamps/up.sql

diff --git a/migrations/2024-03-21-163750_add-kit-configurations-kits-users-timestamps/down.sql b/migrations/2024-03-21-163750_add-kit-configurations-kits-users-timestamps/down.sql
new file mode 100644
index 0000000..365688e
--- /dev/null
+++ b/migrations/2024-03-21-163750_add-kit-configurations-kits-users-timestamps/down.sql
@@ -0,0 +1,19 @@
+DROP TRIGGER kit_configurations_90_updated_at ON kit_configurations;
+
+DROP TRIGGER kits_90_updated_at ON kits;
+
+DROP TRIGGER users_90_updated_at ON users;
+
+DROP FUNCTION bump_updated_at;
+
+ALTER TABLE kit_configurations
+    DROP COLUMN updated_at,
+    DROP COLUMN created_at;
+
+ALTER TABLE kits
+    DROP COLUMN updated_at,
+    DROP COLUMN created_at;
+
+ALTER TABLE users
+    DROP COLUMN updated_at,
+    DROP COLUMN created_at;
diff --git a/migrations/2024-03-21-163750_add-kit-configurations-kits-users-timestamps/up.sql b/migrations/2024-03-21-163750_add-kit-configurations-kits-users-timestamps/up.sql
new file mode 100644
index 0000000..8508f26
--- /dev/null
+++ b/migrations/2024-03-21-163750_add-kit-configurations-kits-users-timestamps/up.sql
@@ -0,0 +1,81 @@
+CREATE FUNCTION bump_updated_at ()
+    RETURNS TRIGGER
+    LANGUAGE plpgsql
+    AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$;
+
+ALTER TABLE kit_configurations
+    ADD created_at timestamptz NOT NULL DEFAULT now(),
+    ADD updated_at timestamptz NOT NULL DEFAULT now();
+
+ALTER TABLE kits
+    ADD created_at timestamptz NOT NULL DEFAULT now(),
+    ADD updated_at timestamptz NOT NULL DEFAULT now();
+
+ALTER TABLE users
+    ADD created_at timestamptz NOT NULL DEFAULT now(),
+    ADD updated_at timestamptz NOT NULL DEFAULT now();
+
+CREATE TRIGGER kit_configurations_90_updated_at
+    BEFORE UPDATE ON kit_configurations
+    FOR EACH ROW
+    EXECUTE FUNCTION bump_updated_at ();
+
+CREATE TRIGGER kits_90_updated_at
+    BEFORE UPDATE ON kits
+    FOR EACH ROW
+    EXECUTE FUNCTION bump_updated_at ();
+
+CREATE TRIGGER users_90_updated_at
+    BEFORE UPDATE ON users
+    FOR EACH ROW
+    EXECUTE FUNCTION bump_updated_at ();
+
+-- As an estimation, set kit_configurations.created_at to the earliest
+-- first_activated_at date and time. A previous migration sets this to the
+-- earliest known measurement, if any.
+UPDATE
+    kit_configurations kc
+SET
+    created_at = kc.first_activated_at
+WHERE
+    kc.first_activated_at IS NOT NULL;
+
+-- As an estimation, set kits.created_at to the earliest
+-- kit_configurations.created_at of that kit.
+UPDATE
+    kits
+SET
+    created_at = kc.created_at_earliest
+FROM (
+    SELECT
+        kit_id,
+        min(created_at) AS created_at_earliest
+    FROM
+        kit_configurations
+    GROUP BY
+        kit_id) AS kc
+WHERE
+    kc.kit_id = id;
+
+-- As an estimation, set users.created_at to the earliest kits.created_at of
+-- kits they are a member of, if any.
+UPDATE
+    users
+SET
+    created_at = m.datetime_earliest
+FROM (
+    SELECT
+        user_id,
+        min(created_at) AS datetime_earliest
+    FROM
+        kits k
+        INNER JOIN kit_memberships km ON k.id = km.kit_id
+    GROUP BY
+        user_id) AS m
+WHERE
+    m.user_id = id;