From 9894fab2b48a7a067b3c4157375f344761d32fe4 Mon Sep 17 00:00:00 2001
From: Simon Martin <oleurud@pm.me>
Date: Wed, 16 Sep 2020 12:18:01 +0200
Subject: [PATCH] CDB_MapConfig table and triggers script

---
 scripts-available/CDB_MapConfig.sql | 57 +++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 scripts-available/CDB_MapConfig.sql

diff --git a/scripts-available/CDB_MapConfig.sql b/scripts-available/CDB_MapConfig.sql
new file mode 100644
index 0000000..179b3d2
--- /dev/null
+++ b/scripts-available/CDB_MapConfig.sql
@@ -0,0 +1,57 @@
+-- Table to save map configs
+CREATE TABLE IF NOT EXISTS
+@extschema@.CDB_MapConfig (
+  id char(32) not null primary key,
+  map jsonb not null, 
+  used_at timestamp with time zone NOT NULL DEFAULT now()
+);
+
+-- trigger function which updates the last day date 
+-- only when the current date is older than 1 day
+CREATE OR REPLACE FUNCTION @extschema@._CDB_MapConfig_Update_Used_At()
+  RETURNS trigger 
+AS $$
+BEGIN
+  IF NEW."used_at" < (now() - '1 days'::interval) THEN
+    NEW."used_at" = NOW();
+    RETURN NEW;
+  END IF;
+END;
+$$ LANGUAGE plpgsql VOLATILE PARALLEL UNSAFE;
+
+--  create trigger
+DROP TRIGGER IF EXISTS update_used_at ON @extschema@.CDB_MapConfig;
+CREATE TRIGGER update_used_at 
+AFTER SELECT ON @extschema@.CDB_MapConfig 
+FOR EACH ROW EXECUTE PROCEDURE @extschema@._CDB_MapConfig_Update_Used_At();
+
+
+-- trigger function which removes the latest map config
+-- if the date is older than 30 days
+CREATE OR REPLACE FUNCTION @extschema@._CDB_MapConfig_Remove_Latest_One()
+  RETURNS trigger 
+AS $$
+BEGIN
+  SELECT id 
+  FROM @extschema@.CDB_MapConfig
+  WHERE used_at < (now() - '30 days'::interval)
+  ORDER BY used_at ASC
+  LIMIT 1 
+  INTO map_id;
+
+  IF map_id IS NOT NULL THEN
+    DELETE FROM @extschema@.CDB_MapConfig
+    WHERE id = map_id;
+  END IF;
+
+END;
+$$ LANGUAGE plpgsql VOLATILE PARALLEL UNSAFE;
+
+--  create trigger
+DROP TRIGGER IF EXISTS remove_latest_one ON @extschema@.CDB_MapConfig;
+CREATE TRIGGER remove_latest_one 
+BEFORE INSERT ON @extschema@.CDB_MapConfig 
+FOR EACH STATEMENT EXECUTE PROCEDURE @extschema@._CDB_MapConfig_Remove_Latest_One();
+
+
+