A task holds the whole night, not one end of it

One command per task was the wrong unit. A charging window is two commands
and reads as one intention, so it was two rows that had to be named twice,
switched off twice, and kept in step by hand — and there was nowhere to put
the third thing, the ease down to 10 A once the house is asleep.

So a task holds a flow. Steps are rows in the editor: an action, a time, and
the ceiling under the one action that takes one. The chargers and the days
belong to the task, because they are the same for every step of a night, and
the switch governs all of it.

The steps keep the order they were written rather than being sorted by the
clock. A night crosses midnight, and clock order files "start at 23:00" last,
behind the stop that closes it — which is not the flow anybody described.
Nothing about firing depends on the order: every step is timed on its own,
and the sweep asks each one whether its minute has come.

Run now moved onto the step. A flow is not a thing that can happen at once —
firing a start and the stop that closes it back to back would leave the
charger where it began and prove nothing — so the button fires the one line
it sits on, and the outcome names the step by its time.

The stored shape changes with it: action/amps/time give way to a steps list.
The collection was a day old and empty, so this replaces them outright rather
than carrying a compatibility path for a schema nothing has run on.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

API Server/internal/models/models.go

@@ -152,14 +152,26 @@ type HomeCharger struct {
 	Created string `json:"created,omitempty"`
 }
 
-// ChargingTask is one line of the home-charger scheduler: an action, a time of
-// day, the days it repeats on, and the chargers it acts on. It belongs to the
-// person, like the chargers themselves — one list covering every charger they
-// own, rather than a separate schedule inside each one.
+// ChargingStep is one command in a task's flow: what to do, and at what time
+// of day. A step is the smallest thing the scheduler sends.
+type ChargingStep struct {
+	// start, stop, limit (to Amps) or boost.
+	Action string  `json:"action"`
+	Amps   float64 `json:"amps,omitempty"`
+
+	// A 24-hour "HH:MM", read in the task's zone.
+	Time string `json:"time"`
+}
+
+// ChargingTask is one entry in the home-charger scheduler: a flow of steps, the
+// days it repeats on, and the chargers it acts on. It belongs to the person,
+// like the chargers themselves — one list covering every charger they own,
+// rather than a separate schedule inside each one.
 //
 // The charger's own cloud schedule can only say "charge between these hours,
-// every day, on this one box". This says "at 23:00 on weeknights, cap these two
-// chargers at 10 A" — several tasks, each naming its own chargers.
+// every day, on this one box". This says "start at 23:00, cap to 10 A at 01:00,
+// stop at 06:30 — on weeknights, on these two chargers", as one named thing that
+// is switched on and off as one.
 type ChargingTask struct {
 	ID   string `json:"id"`
 	Name string `json:"name"`
@@ -169,16 +181,14 @@ type ChargingTask struct {
 	// them" is a standing wish, not the list that happened to exist that day.
 	Chargers []string `json:"chargers"`
 
-	// What to do: start, stop, limit (to Amps) or boost. One action per task; a
-	// charging window is the two tasks that open and close it, which is also how
-	// it is edited and how it is switched off.
-	Action string  `json:"action"`
-	Amps   float64 `json:"amps,omitempty"`
+	// The flow, in the order it runs. A whole charging window lives in one task
+	// rather than in the two that used to open and close it: it is named once,
+	// switched off once, and reads as the one intention it is.
+	Steps []ChargingStep `json:"steps"`
 
-	// When, as a 24-hour "HH:MM" read in Zone — the IANA zone the browser was in
+	// The IANA zone the steps' times are read in — the one the browser was in
 	// when the task was written. The server's own clock is not the one the user
-	// set the time by, and a laptop that travels must not move the schedule.
-	Time string `json:"time"`
+	// set 23:00 by, and a laptop that travels must not move the schedule.
 	Zone string `json:"zone,omitempty"`
 
 	// The weekdays it repeats on, 0=Sunday … 6=Saturday. Empty means every day.
@@ -186,8 +196,9 @@ type ChargingTask struct {
 
 	Enabled bool `json:"enabled"`
 
-	// What happened the last time it fired, so a task that has been failing
-	// quietly for a week says so in the list rather than in a log nobody reads.
+	// What happened the last time a step of it fired, so a task that has been
+	// failing quietly for a week says so in the list rather than in a log nobody
+	// reads.
 	LastRun    string `json:"lastRun,omitempty"` // RFC3339, UTC
 	LastResult string `json:"lastResult,omitempty"`