From d903d05c8239fd15cd48b81590c1b95d4d3a69a3 Mon Sep 17 00:00:00 2001
From: "Alexander A. Klimov" <alexander.klimov@icinga.com>
Date: Tue, 26 Oct 2021 17:52:39 +0200
Subject: [PATCH] Make History*#Id UUID -> SHA1

---
 pkg/icingadb/v1/history/meta.go     | 4 ++--
 schema/mysql/schema.sql             | 2 +-
 schema/mysql/upgrades/1.0.0-rc2.sql | 1 +
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/pkg/icingadb/v1/history/meta.go b/pkg/icingadb/v1/history/meta.go
index bb9aad2f..434ed118 100644
--- a/pkg/icingadb/v1/history/meta.go
+++ b/pkg/icingadb/v1/history/meta.go
@@ -25,7 +25,7 @@ func (hte HistoryTableEntity) Upsert() interface{} {
 
 // HistoryEntity is embedded by every concrete history type.
 type HistoryEntity struct {
-	Id types.UUID `json:"event_id"`
+	Id types.Binary `json:"event_id"`
 }
 
 // Fingerprint implements part of the contracts.Entity interface.
@@ -40,7 +40,7 @@ func (he HistoryEntity) ID() contracts.ID {
 
 // SetID implements part of the contracts.Entity interface.
 func (he *HistoryEntity) SetID(id contracts.ID) {
-	he.Id = id.(types.UUID)
+	he.Id = id.(types.Binary)
 }
 
 // Upsert implements the contracts.Upserter interface.
diff --git a/schema/mysql/schema.sql b/schema/mysql/schema.sql
index 18f9cb3d..faae4e02 100644
--- a/schema/mysql/schema.sql
+++ b/schema/mysql/schema.sql
@@ -1061,7 +1061,7 @@ CREATE TABLE acknowledgement_history (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin ROW_FORMAT=DYNAMIC;
 
 CREATE TABLE history (
-  id binary(16) NOT NULL COMMENT 'notification_history_id, state_history_id or UUID',
+  id binary(20) NOT NULL COMMENT 'sha1(environment.name + event_type + x...) given that sha1(environment.name + x...) = *_history_id',
   environment_id binary(20) NOT NULL COMMENT 'environment.id',
   endpoint_id binary(20) DEFAULT NULL COMMENT 'endpoint.id',
   object_type enum('host', 'service') NOT NULL,
diff --git a/schema/mysql/upgrades/1.0.0-rc2.sql b/schema/mysql/upgrades/1.0.0-rc2.sql
index 6c3ff620..43a7e663 100644
--- a/schema/mysql/upgrades/1.0.0-rc2.sql
+++ b/schema/mysql/upgrades/1.0.0-rc2.sql
@@ -182,6 +182,7 @@ ALTER TABLE user_notification_history
     MODIFY notification_history_id binary(20) NOT NULL COMMENT 'UUID notification_history.id';
 
 ALTER TABLE history
+    MODIFY id binary(20) NOT NULL COMMENT 'sha1(environment.name + event_type + x...) given that sha1(environment.name + x...) = *_history_id',
     MODIFY notification_history_id binary(20) DEFAULT NULL COMMENT 'notification_history.id',
     MODIFY state_history_id binary(20) DEFAULT NULL COMMENT 'state_history.id',
     ADD CONSTRAINT fk_history_acknowledgement_history FOREIGN KEY (acknowledgement_history_id) REFERENCES acknowledgement_history (id) ON DELETE CASCADE,