+FEATURE: double entry info

views/routes/almanach/edit/body.gohtml

@@ -18,6 +18,7 @@ type AlmanachResult struct {
 -->
 
 <almanach-edit-page>
+<duplicate-warning-checker></duplicate-warning-checker>
 
 <div class="flex container-normal bg-slate-100 mx-auto px-8">
 	<div class="flex flex-row w-full justify-between">
@@ -166,7 +167,11 @@ type AlmanachResult struct {
 				<div class="inputlabelrow">
 					<label for="preferred_title" class="inputlabel">Kurztitel</label>
 				</div>
-				<textarea name="preferred_title" id="preferred_title" class="inputinput no-enter" placeholder="" required autocomplete="off" rows="1">{{- $model.result.Entry.PreferredTitle -}}</textarea>
+				<textarea name="preferred_title" id="preferred_title" class="inputinput no-enter" placeholder="" required autocomplete="off" rows="1" data-duplicate-check data-duplicate-endpoint="/api/entries/search" data-duplicate-result-key="entries" data-duplicate-current-id="{{ if not $model.is_new }}{{ $model.result.Entry.Id }}{{ end }}">{{- $model.result.Entry.PreferredTitle -}}</textarea>
+				<div class="duplicate-warning hidden" data-duplicate-warning-for="preferred_title">
+					<i class="ri-information-line"></i>
+					<span data-duplicate-count></span>
+				</div>
 			</div>
 
 			<div class="mt-3">

views/routes/ort/edit/body.gohtml

@@ -2,6 +2,7 @@
 {{ $place := $model.result.Place }}
 
 <edit-page>
+<duplicate-warning-checker></duplicate-warning-checker>
 <div class="flex container-normal bg-slate-100 mx-auto px-8">
 	<div class="flex flex-row w-full justify-between">
 		<div class="flex flex-col justify-end-safe flex-2/5">
@@ -115,7 +116,11 @@
 					<div class="inputlabelrow">
 						<label for="name" class="inputlabel">Name</label>
 					</div>
-					<textarea name="name" id="name" class="inputinput no-enter" autocomplete="off" rows="1">{{- $place.Name -}}</textarea>
+					<textarea name="name" id="name" class="inputinput no-enter" autocomplete="off" rows="1" data-duplicate-check data-duplicate-endpoint="/api/places/search" data-duplicate-result-key="places" data-duplicate-current-id="{{ if not $model.is_new }}{{ $place.Id }}{{ end }}">{{- $place.Name -}}</textarea>
+					<div class="duplicate-warning hidden" data-duplicate-warning-for="name">
+						<i class="ri-information-line"></i>
+						<span data-duplicate-count></span>
+					</div>
 				</div>
 				<div class="inputwrapper">
 					<div class="inputlabelrow">

views/routes/person/edit/body.gohtml

@@ -2,6 +2,7 @@
 {{ $agent := $model.result.Agent }}
 
 <edit-page>
+<duplicate-warning-checker></duplicate-warning-checker>
 <div class="flex container-normal bg-slate-100 mx-auto px-8">
 	<div class="flex flex-row w-full justify-between">
 		<div class="flex flex-col justify-end-safe flex-2/5">
@@ -117,7 +118,11 @@
 					<div class="inputlabelrow">
 						<label for="name" class="inputlabel">Name</label>
 					</div>
-					<textarea name="name" id="name" class="inputinput no-enter" autocomplete="off" rows="1">{{- $agent.Name -}}</textarea>
+					<textarea name="name" id="name" class="inputinput no-enter" autocomplete="off" rows="1" data-duplicate-check data-duplicate-endpoint="/api/agents/search" data-duplicate-result-key="agents" data-duplicate-current-id="{{ if not $model.is_new }}{{ $agent.Id }}{{ end }}">{{- $agent.Name -}}</textarea>
+					<div class="duplicate-warning hidden" data-duplicate-warning-for="name">
+						<i class="ri-information-line"></i>
+						<span data-duplicate-count></span>
+					</div>
 				</div>
 				<div class="inputwrapper">
 					<div class="inputlabelrow">

views/routes/reihe/edit/body.gohtml

@@ -2,6 +2,7 @@
 {{ $series := $model.result.Series }}
 
 <edit-page>
+<duplicate-warning-checker></duplicate-warning-checker>
 <div class="flex container-normal bg-slate-100 mx-auto px-8">
 	<div class="flex flex-row w-full justify-between">
 		<div class="flex flex-col justify-end-safe flex-2/5">
@@ -117,7 +118,11 @@
 					<div class="inputlabelrow">
 						<label for="title" class="inputlabel">Reihentitel</label>
 					</div>
-					<textarea name="title" id="title" class="inputinput no-enter" autocomplete="off" rows="1">{{- $series.Title -}}</textarea>
+					<textarea name="title" id="title" class="inputinput no-enter" autocomplete="off" rows="1" data-duplicate-check data-duplicate-endpoint="/api/series/search" data-duplicate-result-key="series" data-duplicate-current-id="{{ if not $model.is_new }}{{ $series.Id }}{{ end }}">{{- $series.Title -}}</textarea>
+					<div class="duplicate-warning hidden" data-duplicate-warning-for="title">
+						<i class="ri-information-line"></i>
+						<span data-duplicate-count></span>
+					</div>
 				</div>
 				<div class="inputwrapper">
 					<div class="inputlabelrow">

views/transform/duplicate-warning.js

@@ -0,0 +1,96 @@
+const DEBOUNCE_DELAY_MS = 100;
+
+export class DuplicateWarningChecker extends HTMLElement {
+	constructor() {
+		super();
+		this._fields = null;
+		this._boundHandlers = new Map();
+	}
+
+	connectedCallback() {
+		// Find all fields marked for duplicate checking
+		this._fields = document.querySelectorAll("[data-duplicate-check]");
+
+		this._fields.forEach((field) => {
+			const handler = this._createHandler(field);
+			this._boundHandlers.set(field, handler);
+			field.addEventListener("input", handler);
+		});
+	}
+
+	disconnectedCallback() {
+		this._boundHandlers.forEach((handler, field) => {
+			field.removeEventListener("input", handler);
+		});
+		this._boundHandlers.clear();
+	}
+
+	_createHandler(field) {
+		let timeout = null;
+		return (event) => {
+			if (timeout) {
+				clearTimeout(timeout);
+			}
+			timeout = setTimeout(() => {
+				this._checkDuplicates(field);
+			}, DEBOUNCE_DELAY_MS);
+		};
+	}
+
+	async _checkDuplicates(field) {
+		const value = field.value.trim();
+		const endpoint = field.getAttribute("data-duplicate-endpoint");
+		const resultKey = field.getAttribute("data-duplicate-result-key");
+		const currentId = field.getAttribute("data-duplicate-current-id") || "";
+		const warningEl = document.querySelector(`[data-duplicate-warning-for="${field.id}"]`);
+
+		if (!warningEl || !endpoint || !resultKey) {
+			return;
+		}
+
+		// Hide warning if field is empty
+		if (value === "") {
+			warningEl.classList.add("hidden");
+			return;
+		}
+
+		// Fetch duplicates
+		try {
+			const url = new URL(endpoint, window.location.origin);
+			url.searchParams.set("q", value);
+			url.searchParams.set("limit", "100"); // Get all to filter
+
+			const response = await fetch(url.toString());
+			if (!response.ok) {
+				return;
+			}
+
+			const data = await response.json();
+			const results = data[resultKey] || [];
+
+			// Filter out current item if editing
+			let filtered = results;
+			if (currentId) {
+				filtered = results.filter((item) => item.id !== currentId);
+			}
+
+			// Filter for exact matches only (case-insensitive)
+			const exactMatches = filtered.filter((item) => item.name && item.name.toLowerCase() === value.toLowerCase());
+
+			// Show or hide warning
+			if (exactMatches.length > 0) {
+				const countEl = warningEl.querySelector("[data-duplicate-count]");
+				if (countEl) {
+					const plural = exactMatches.length === 1 ? "" : "e";
+					countEl.textContent = `Der Name ist bereits vorhanden (${exactMatches.length} Treffer${plural})`;
+				}
+				warningEl.classList.remove("hidden");
+			} else {
+				warningEl.classList.add("hidden");
+			}
+		} catch (err) {
+			// Silently fail - don't show errors to user
+			console.error("Duplicate check failed:", err);
+		}
+	}
+}

views/transform/form.css

@@ -45,6 +45,10 @@
 					disabled:opacity-50 py-1 px-3;
 	}
 
+	.dbform .duplicate-warning {
+		@apply text-sm text-sky-600 mt-0.5 pl-2.5 pb-1.5 flex items-center gap-1;
+	}
+
 	/* Status select color coding */
 	.status-select[data-status="Edited"] {
 		@apply bg-green-100 text-green-900;

views/transform/main.js

@@ -27,6 +27,7 @@ import { AlmanachEditPage } from "./almanach-edit.js";
 import { RelationsEditor } from "./relations-editor.js";
 import { EditPage } from "./edit-page.js";
 import { FabMenu } from "./fab-menu.js";
+import { DuplicateWarningChecker } from "./duplicate-warning.js";
 
 const FILTER_LIST_ELEMENT = "filter-list";
 const FAB_MENU_ELEMENT = "fab-menu";
@@ -47,6 +48,7 @@ const ITEMS_EDITOR_ELEMENT = "items-editor";
 const ALMANACH_EDIT_PAGE_ELEMENT = "almanach-edit-page";
 const RELATIONS_EDITOR_ELEMENT = "relations-editor";
 const EDIT_PAGE_ELEMENT = "edit-page";
+const DUPLICATE_WARNING_ELEMENT = "duplicate-warning-checker";
 
 customElements.define(INT_LINK_ELEMENT, IntLink);
 customElements.define(ABBREV_TOOLTIPS_ELEMENT, AbbreviationTooltips);
@@ -67,6 +69,7 @@ customElements.define(ALMANACH_EDIT_PAGE_ELEMENT, AlmanachEditPage);
 customElements.define(RELATIONS_EDITOR_ELEMENT, RelationsEditor);
 customElements.define(EDIT_PAGE_ELEMENT, EditPage);
 customElements.define(FAB_MENU_ELEMENT, FabMenu);
+customElements.define(DUPLICATE_WARNING_ELEMENT, DuplicateWarningChecker);
 
 function PathPlusQuery() {
 	const path = window.location.pathname;