From 73c134dd83b705ae254a191340302c20ca0f28a0 Mon Sep 17 00:00:00 2001
From: Raymond Bourges <raymond.bourges@univ-rennes.fr>
Date: Wed, 4 Mar 2026 19:46:33 +0100
Subject: [PATCH] FEAT : hypertable et select dessus

---
 docker-compose.yml |  7 +++++
 notes.md           | 68 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 docker-compose.yml
 create mode 100644 notes.md

diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..dea6070
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,7 @@
+services:
+  timescaledb:
+    image: timescale/timescaledb-ha:pg18
+    ports:
+      - 5432:5432
+    environment:
+      - POSTGRES_PASSWORD=postgres
\ No newline at end of file
diff --git a/notes.md b/notes.md
new file mode 100644
index 0000000..d90e29a
--- /dev/null
+++ b/notes.md
@@ -0,0 +1,68 @@
+# timescaledb
+
+<https://github.com/timescale/timescaledb>
+
+## Test
+
+### Récup datas
+
+```bash
+ssh grab-4
+docker exec -t client-demo-postgres-1 pg_dump -Fc -U postgres -d postgres -f /tmp/backup_postgres.dump
+docker cp client-demo-postgres-1:/tmp/backup_postgres.dump /tmp/backup_postgres.dump
+exit
+
+cd /tmp
+scp grab-4:/tmp/backup_postgres.dump .
+pg_restore -c -x -t mesure -d postgres -h localhost -U postgres -W  backup_postgres.dump
+pg_restore -c -x -I mesure_idx1 -d postgres -h localhost -U postgres -W  backup_postgres.dump
+pg_restore -c -x -I mesure_idx2 -d postgres -h localhost -U postgres -W  backup_postgres.dump
+```
+
+### Création d'une hypertable
+
+```sql
+CREATE TABLE mesure_ng (
+  "date" TIMESTAMPTZ,
+  id_captation INT NOT NULL,
+  valeur float4 NOT NULL,
+) WITH (
+  tsdb.hypertable,
+  timescaledb.segmentby = 'id_captation',
+  timescaledb.orderby='time DESC'
+)
+
+INSERT INTO mesure_ng ("date", id_captation, valeur)
+  SELECT "date", id_captation, valeur
+    FROM mesure
+```
+
+### Ex. de requête
+
+```sql
+SELECT
+  time_bucket('1 hour', "date") AS heure,
+  round(
+    average(
+      time_weight('linear', "date", valeur)
+    )
+  ) AS moyenne_conso,
+  COUNT(*) AS nombre_de_mesures
+FROM
+  mesure_ng
+WHERE
+  "date" BETWEEN '2026-03-01 00:00:00' AND '2026-03-31 23:59:59'
+  and id_captation = 59 -- puissance PAC
+GROUP BY
+  heure
+ORDER BY
+  heure;
+```
+
+### Continuous aggregates (WIP)
+
+<https://www.tigerdata.com/docs/use-timescale/latest/continuous-aggregates/create-a-continuous-aggregate>
+
+* CREATE MATERIALIZED VIEW
+* SELECT add_continuous_aggregate_policy
+* supprimer les "vieilles" données de mesure_ng
\ No newline at end of file