diff --git a/src/schemas/warehouse.schema.ts b/src/schemas/warehouse.schema.ts
new file mode 100644
index 0000000..119cc3f
--- /dev/null
+++ b/src/schemas/warehouse.schema.ts
@@ -0,0 +1,242 @@
+import { z } from "zod";
+
+// === Categories ===
+export const CreateCategorySchema = z.object({
+  name: z.string().min(1, "Název je povinný"),
+  description: z.string().nullish(),
+  sort_order: z
+    .union([z.number(), z.string()])
+    .transform((v) => Number(v))
+    .optional()
+    .default(0),
+});
+export const UpdateCategorySchema = z.object({
+  name: z.string().min(1, "Název je povinný").optional(),
+  description: z.string().nullish(),
+  sort_order: z
+    .union([z.number(), z.string()])
+    .transform((v) => Number(v))
+    .optional(),
+});
+export type CreateCategoryInput = z.infer<typeof CreateCategorySchema>;
+export type UpdateCategoryInput = z.infer<typeof UpdateCategorySchema>;
+
+// === Suppliers ===
+export const CreateSupplierSchema = z.object({
+  name: z.string().min(1, "Název je povinný"),
+  ico: z.string().nullish(),
+  dic: z.string().nullish(),
+  contact_person: z.string().nullish(),
+  email: z.string().nullish(),
+  phone: z.string().nullish(),
+  address: z.string().nullish(),
+  notes: z.string().nullish(),
+  is_active: z
+    .preprocess((v) => v === true || v === 1 || v === "1", z.boolean())
+    .optional()
+    .default(true),
+});
+export const UpdateSupplierSchema = z.object({
+  name: z.string().min(1, "Název je povinný").optional(),
+  ico: z.string().nullish(),
+  dic: z.string().nullish(),
+  contact_person: z.string().nullish(),
+  email: z.string().nullish(),
+  phone: z.string().nullish(),
+  address: z.string().nullish(),
+  notes: z.string().nullish(),
+  is_active: z
+    .preprocess((v) => v === true || v === 1 || v === "1", z.boolean())
+    .optional(),
+});
+export type CreateSupplierInput = z.infer<typeof CreateSupplierSchema>;
+export type UpdateSupplierInput = z.infer<typeof UpdateSupplierSchema>;
+
+// === Locations ===
+export const CreateLocationSchema = z.object({
+  code: z.string().min(1, "Kód je povinný"),
+  name: z.string().min(1, "Název je povinný"),
+  description: z.string().nullish(),
+  is_active: z
+    .preprocess((v) => v === true || v === 1 || v === "1", z.boolean())
+    .optional()
+    .default(true),
+});
+export const UpdateLocationSchema = z.object({
+  code: z.string().min(1, "Kód je povinný").optional(),
+  name: z.string().min(1, "Název je povinný").optional(),
+  description: z.string().nullish(),
+  is_active: z
+    .preprocess((v) => v === true || v === 1 || v === "1", z.boolean())
+    .optional(),
+});
+export type CreateLocationInput = z.infer<typeof CreateLocationSchema>;
+export type UpdateLocationInput = z.infer<typeof UpdateLocationSchema>;
+
+// === Items ===
+const UNIT_LIST = ["ks", "m", "kg", "bal", "sada", "m2", "m3", "l"] as const;
+export const UnitEnum = z.enum(UNIT_LIST);
+export type Unit = z.infer<typeof UnitEnum>;
+
+export const CreateItemSchema = z.object({
+  item_number: z.string().nullish(),
+  name: z.string().min(1, "Název je povinný"),
+  description: z.string().nullish(),
+  category_id: z
+    .union([z.number(), z.string(), z.null()])
+    .transform((v) => (v === null ? null : Number(v)))
+    .nullish(),
+  unit: UnitEnum,
+  min_quantity: z
+    .union([z.number(), z.string(), z.null()])
+    .transform((v) => (v === null ? null : Number(v)))
+    .nullish(),
+  notes: z.string().nullish(),
+  is_active: z
+    .preprocess((v) => v === true || v === 1 || v === "1", z.boolean())
+    .optional()
+    .default(true),
+});
+export const UpdateItemSchema = z.object({
+  item_number: z.string().nullish(),
+  name: z.string().min(1, "Název je povinný").optional(),
+  description: z.string().nullish(),
+  category_id: z
+    .union([z.number(), z.string(), z.null()])
+    .transform((v) => (v === null ? null : Number(v)))
+    .nullish(),
+  unit: UnitEnum.optional(),
+  min_quantity: z
+    .union([z.number(), z.string(), z.null()])
+    .transform((v) => (v === null ? null : Number(v)))
+    .nullish(),
+  notes: z.string().nullish(),
+  is_active: z
+    .preprocess((v) => v === true || v === 1 || v === "1", z.boolean())
+    .optional(),
+});
+export type CreateItemInput = z.infer<typeof CreateItemSchema>;
+export type UpdateItemInput = z.infer<typeof UpdateItemSchema>;
+
+// === Receipts ===
+export const ReceiptLineSchema = z.object({
+  item_id: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  quantity: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  unit_price: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  location_id: z
+    .union([z.number(), z.string(), z.null()])
+    .transform((v) => (v === null ? null : Number(v)))
+    .nullish(),
+  notes: z.string().nullish(),
+});
+
+export const CreateReceiptSchema = z.object({
+  supplier_id: z
+    .union([z.number(), z.string(), z.null()])
+    .transform((v) => (v === null ? null : Number(v)))
+    .nullish(),
+  delivery_note_number: z.string().nullish(),
+  delivery_note_date: z.union([z.string(), z.null()]).nullish(),
+  notes: z.string().nullish(),
+  lines: z
+    .array(ReceiptLineSchema)
+    .min(1, "Příjem musí obsahovat alespoň jednu položku"),
+});
+export const UpdateReceiptSchema = z.object({
+  supplier_id: z
+    .union([z.number(), z.string(), z.null()])
+    .transform((v) => (v === null ? null : Number(v)))
+    .nullish(),
+  delivery_note_number: z.string().nullish(),
+  delivery_note_date: z.union([z.string(), z.null()]).nullish(),
+  notes: z.string().nullish(),
+  lines: z
+    .array(ReceiptLineSchema)
+    .min(1, "Příjem musí obsahovat alespoň jednu položku")
+    .optional(),
+});
+export type CreateReceiptInput = z.infer<typeof CreateReceiptSchema>;
+export type UpdateReceiptInput = z.infer<typeof UpdateReceiptSchema>;
+export type ReceiptLineInput = z.infer<typeof ReceiptLineSchema>;
+
+// === Issues ===
+export const IssueLineSchema = z.object({
+  item_id: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  batch_id: z
+    .union([z.number(), z.string()])
+    .transform((v) => Number(v))
+    .nullish(),
+  quantity: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  location_id: z
+    .union([z.number(), z.string(), z.null()])
+    .transform((v) => (v === null ? null : Number(v)))
+    .nullish(),
+  reservation_id: z
+    .union([z.number(), z.string(), z.null()])
+    .transform((v) => (v === null ? null : Number(v)))
+    .nullish(),
+  notes: z.string().nullish(),
+});
+
+export const CreateIssueSchema = z.object({
+  project_id: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  notes: z.string().nullish(),
+  lines: z
+    .array(IssueLineSchema)
+    .min(1, "Výdej musí obsahovat alespoň jednu položku"),
+});
+export const UpdateIssueSchema = z.object({
+  project_id: z
+    .union([z.number(), z.string()])
+    .transform((v) => Number(v))
+    .optional(),
+  notes: z.string().nullish(),
+  lines: z
+    .array(IssueLineSchema)
+    .min(1, "Výdej musí obsahovat alespoň jednu položku")
+    .optional(),
+});
+export type CreateIssueInput = z.infer<typeof CreateIssueSchema>;
+export type UpdateIssueInput = z.infer<typeof UpdateIssueSchema>;
+export type IssueLineInput = z.infer<typeof IssueLineSchema>;
+
+// === Reservations ===
+export const CreateReservationSchema = z.object({
+  item_id: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  project_id: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  quantity: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  notes: z.string().nullish(),
+});
+export type CreateReservationInput = z.infer<typeof CreateReservationSchema>;
+
+// === Inventory ===
+export const InventoryLineSchema = z.object({
+  item_id: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  location_id: z
+    .union([z.number(), z.string(), z.null()])
+    .transform((v) => (v === null ? null : Number(v)))
+    .nullish(),
+  actual_qty: z.union([z.number(), z.string()]).transform((v) => Number(v)),
+  notes: z.string().nullish(),
+});
+
+export const CreateInventorySessionSchema = z.object({
+  notes: z.string().nullish(),
+  lines: z
+    .array(InventoryLineSchema)
+    .min(1, "Inventura musí obsahovat alespoň jednu položku"),
+});
+export const UpdateInventorySessionSchema = z.object({
+  notes: z.string().nullish(),
+  lines: z
+    .array(InventoryLineSchema)
+    .min(1, "Inventura musí obsahovat alespoň jednu položku")
+    .optional(),
+});
+export type CreateInventorySessionInput = z.infer<
+  typeof CreateInventorySessionSchema
+>;
+export type UpdateInventorySessionInput = z.infer<
+  typeof UpdateInventorySessionSchema
+>;
+export type InventoryLineInput = z.infer<typeof InventoryLineSchema>;