Persist material consumption snapshots

db/schema.sql

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+CREATE TABLE IF NOT EXISTS material_consumption_snapshots (
+    timestamp timestamptz NOT NULL,
+    calculation_id text NOT NULL,
+    machine_id text NOT NULL,
+    production_order text NOT NULL,
+    run_id text NOT NULL,
+    consumption_kg double precision NOT NULL,
+    PRIMARY KEY (calculation_id, machine_id, production_order, timestamp)
+);
+
+-- Machine time series across orders; the primary key covers a specific order.
+CREATE INDEX IF NOT EXISTS material_consumption_snapshots_machine_time_idx
+    ON material_consumption_snapshots (calculation_id, machine_id, timestamp);