feat: phase 3 — history endpoints (start, entries, complete)

backend/src/validators/history.validators.ts

@@ -0,0 +1,21 @@
+import { z } from "zod";
+
+export const startHistorySchema = z.object({
+  programId: z.string().min(1),
+});
+
+export const addEntrySchema = z.object({
+  exerciseId: z.string().min(1),
+  sets: z.number().int().min(1),
+  reps: z.number().int().min(1).optional(),
+  weightKg: z.number().min(0).optional(),
+  durationSec: z.number().int().min(1).optional(),
+});
+
+export const completeHistorySchema = z.object({
+  notes: z.string().max(500).optional(),
+});
+
+export type StartHistoryInput = z.infer<typeof startHistorySchema>;
+export type AddEntryInput = z.infer<typeof addEntrySchema>;
+export type CompleteHistoryInput = z.infer<typeof completeHistorySchema>;