minimal working example with diesel

migrations/00000000000000_diesel_initial_setup/down.sql

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+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass);
+DROP FUNCTION IF EXISTS diesel_set_updated_at();

migrations/00000000000000_diesel_initial_setup/up.sql

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+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+
+
+
+-- Sets up a trigger for the given table to automatically set a column called
+-- `updated_at` whenever the row is modified (unless `updated_at` was included
+-- in the modified columns)
+--
+-- # Example
+--
+-- ```sql
+-- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
+--
+-- SELECT diesel_manage_updated_at('users');
+-- ```
+CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
+BEGIN
+    EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
+                    FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
+BEGIN
+    IF (
+        NEW IS DISTINCT FROM OLD AND
+        NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
+    ) THEN
+        NEW.updated_at := current_timestamp;
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;

migrations/2026-01-28-134347-0000_locations/down.sql

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+DROP TABLE locations;
+DROP TYPE battery_status_enum CASCADE

migrations/2026-01-28-134347-0000_locations/up.sql

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+CREATE TYPE battery_status_enum AS ENUM ('unknown', 'unplugged', 'charging', 'full');
+
+CREATE TABLE locations (
+    timestamp bigint PRIMARY KEY,
+    latitude numeric(9,6) NOT NULL,
+    longitude numeric(9,6) NOT NULL,
+    accuracy numeric(7,2) NOT NULL,
+    altitude numeric(7,2),
+    velocity numeric(7,2),
+    battery_level smallint NOT NULL,
+    bearing numeric(6,3),
+    battery_status battery_status_enum DEFAULT 'unknown' NOT NULL,
+    CONSTRAINT Location_battery_level_check CHECK ((battery_level >= 0) AND (battery_level <= 100)),
+    CONSTRAINT Location_bearing_check CHECK ((bearing >= (0)::numeric) AND (bearing <= (360)::numeric))
+)
+WITH (oids = false);
+
+CREATE INDEX locations_timestamp ON locations USING btree (timestamp);