feat: add API to get daily consumption

server/app/adapters/postgres_query.py

@@ -0,0 +1,54 @@
+from datetime import datetime
+
+import psycopg2
+from psycopg2.extensions import connection
+
+from domain.entities import ConsumptionPoint
+from domain.exceptions import DatabaseError
+from domain.value_objects import Granularity
+from ports.reading_query_repository import ReadingQueryRepository
+
+
+class PgReadingQueryRepository(ReadingQueryRepository):
+    def __init__(self, conn: connection) -> None:
+        self._conn = conn
+
+    def get_consumption(
+        self,
+        dev_eui: str,
+        start: datetime,
+        end: datetime,
+        granularity: Granularity,
+    ) -> list[ConsumptionPoint]:
+        date_trunc = granularity
+        query = """
+            SELECT
+                DATE_TRUNC(%s, r.date)          AS period,
+                MIN(r.pulses)                   AS pulse_start,
+                MAX(r.pulses)                   AS pulse_end,
+                MAX(r.pulses) - MIN(r.pulses)   AS delta_pulses
+            FROM reading r
+            JOIN device d ON d.device_id = r.device_id
+            WHERE d.device_eui = %s
+              AND r.date >= %s
+              AND r.date <  %s
+            GROUP BY period
+            ORDER BY period ASC
+        """
+        try:
+            with self._conn.cursor() as cur:
+                cur.execute(query, (date_trunc, dev_eui, start, end))
+                rows = cur.fetchall()
+        except psycopg2.DatabaseError as e:
+            raise DatabaseError(f"Erreur requête consumption : {e}") from e
+
+        return [
+            ConsumptionPoint(
+                period=row[0],
+                pulse_count_start=row[1],
+                pulse_count_end=row[2],
+                delta_pulses=row[3],
+                delta_m3=round(row[3] * 0.010, 3),
+            )
+            for row in rows
+        ]