feat(banking A): bank accounts module + finance integration

First of 3-step banking expansion. Banks tracked separately from
customer/supplier debts so we can compute real cash position later.

Schema:
- New bank_accounts table: bankName, accountName, iban, openingBalance,
  notes, archived. Indexes on (tenantId, archived).
- New column finance_entries.bankAccountId (FK, optional). Index on
  (tenantId, bankAccountId).
- schema.ts: TABLES.bankAccounts, BankAccount type, FinanceEntry gains
  bankAccountId.

Server side:
- lib/validation/bank-accounts.ts (Zod): IBAN normalized to upper-case
  no-spaces; openingBalance defaults to 0.
- lib/appwrite/bank-account-actions.ts: create/update/archive(toggle)/
  delete with audit. Delete refuses if any finance_entry still references
  the account; archive toggle replaces it for safe disable.
- lib/appwrite/bank-account-queries.ts:
  * listBankAccounts
  * getBankAccountBalances — computes opening + Σ(income) − Σ(expense)
    per account by scanning up to 5000 entries with bankAccountId set.
    Pure cash flow; debt/receivable don't move balance.
  * listEntriesForAccount

UI:
- /finance/banks server page renders BanksClient with computed balances.
- BanksClient: card grid for active accounts, collapsed details for
  archived. Sum card on top showing total active balance (color-coded by
  sign). Each card shows bank, account name, formatted IBAN, current
  balance + opening (if drifted). Dropdown: Düzenle / Arşivle / Sil.
- BankFormSheet: bank/account/IBAN/openingBalance/notes form.
- Finance form gets a bank-account Select (sentinel-stripped). Existing
  finance entries get a 'bankAccountLabel' subtitle in their row.

Sidebar: Finans group expanded with Bankalar submenu (Banka hesapları
/ Krediler / Kredi kartları). The latter two land in B and C.

src/app/(dashboard)/finance/banks/components/bank-form-sheet.tsx

@@ -0,0 +1,159 @@
+"use client";
+
+import { useActionState, useEffect } from "react";
+import { Loader2, Save } from "lucide-react";
+import { toast } from "sonner";
+
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import {
+  Sheet,
+  SheetContent,
+  SheetDescription,
+  SheetFooter,
+  SheetHeader,
+  SheetTitle,
+} from "@/components/ui/sheet";
+import { Textarea } from "@/components/ui/textarea";
+import {
+  createBankAccountAction,
+  updateBankAccountAction,
+} from "@/lib/appwrite/bank-account-actions";
+import { initialBankAccountState } from "@/lib/appwrite/bank-account-types";
+
+import type { BankAccountRow } from "./types";
+
+type Props = {
+  open: boolean;
+  onOpenChange: (v: boolean) => void;
+  account?: BankAccountRow | null;
+};
+
+export function BankFormSheet({ open, onOpenChange, account }: Props) {
+  const isEdit = Boolean(account);
+  const action = isEdit ? updateBankAccountAction : createBankAccountAction;
+  const [state, formAction, isPending] = useActionState(action, initialBankAccountState);
+
+  useEffect(() => {
+    if (state.ok) {
+      toast.success(isEdit ? "Hesap güncellendi." : "Hesap eklendi.");
+      onOpenChange(false);
+    } else if (state.error) {
+      toast.error(state.error);
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [state]);
+
+  return (
+    <Sheet open={open} onOpenChange={onOpenChange}>
+      <SheetContent className="flex w-full flex-col gap-0 p-0 sm:max-w-xl">
+        <SheetHeader className="border-b px-6 py-4">
+          <SheetTitle>{isEdit ? "Hesabı düzenle" : "Yeni banka hesabı"}</SheetTitle>
+          <SheetDescription>
+            Açılış bakiyesi sonradan değiştirilirse bütün hareketler aynı kalır, sadece toplam
+            kayar.
+          </SheetDescription>
+        </SheetHeader>
+
+        <form action={formAction} className="flex flex-1 flex-col">
+          {isEdit && account && <input type="hidden" name="id" value={account.id} />}
+
+          <div className="flex-1 space-y-4 overflow-y-auto px-6 py-5">
+            <div className="grid gap-4 md:grid-cols-2">
+              <div className="grid gap-2">
+                <Label htmlFor="bankName">Banka *</Label>
+                <Input
+                  id="bankName"
+                  name="bankName"
+                  defaultValue={account?.bankName ?? ""}
+                  placeholder="Örn. Garanti BBVA"
+                  required
+                />
+                {state.fieldErrors?.bankName && (
+                  <p className="text-destructive text-xs">{state.fieldErrors.bankName}</p>
+                )}
+              </div>
+              <div className="grid gap-2">
+                <Label htmlFor="accountName">Hesap adı *</Label>
+                <Input
+                  id="accountName"
+                  name="accountName"
+                  defaultValue={account?.accountName ?? ""}
+                  placeholder="Örn. Şirket TL Vadesiz"
+                  required
+                />
+                {state.fieldErrors?.accountName && (
+                  <p className="text-destructive text-xs">{state.fieldErrors.accountName}</p>
+                )}
+              </div>
+            </div>
+
+            <div className="grid gap-2">
+              <Label htmlFor="iban">IBAN</Label>
+              <Input
+                id="iban"
+                name="iban"
+                defaultValue={account?.iban ?? ""}
+                placeholder="TR.. .... .... .... .... .... .."
+                style={{ fontFamily: "monospace", textTransform: "uppercase" }}
+              />
+            </div>
+
+            <div className="grid gap-2">
+              <Label htmlFor="openingBalance">Açılış bakiyesi (₺)</Label>
+              <Input
+                id="openingBalance"
+                name="openingBalance"
+                type="number"
+                step="0.01"
+                defaultValue={account?.openingBalance ?? 0}
+                placeholder="0.00"
+              />
+              <p className="text-muted-foreground text-xs">
+                Bu hesabı sisteme eklediğinizdeki bakiye. Sonraki hareketler bu rakamın üstüne eklenir.
+              </p>
+            </div>
+
+            <div className="grid gap-2">
+              <Label htmlFor="notes">Notlar</Label>
+              <Textarea
+                id="notes"
+                name="notes"
+                rows={3}
+                defaultValue={account?.notes ?? ""}
+                placeholder="Şube, yetkili, müşteri no, vb."
+              />
+            </div>
+          </div>
+
+          <SheetFooter className="border-t bg-muted/30 px-6 py-4">
+            <div className="flex w-full justify-end gap-2">
+              <Button
+                type="button"
+                variant="outline"
+                onClick={() => onOpenChange(false)}
+                disabled={isPending}
+              >
+                Vazgeç
+              </Button>
+              <Button type="submit" disabled={isPending}>
+                {isPending ? (
+                  <>
+                    <Loader2 className="size-4 animate-spin" />
+                    Kaydediliyor...
+                  </>
+                ) : (
+                  <>
+                    <Save className="size-4" />
+                    {isEdit ? "Güncelle" : "Kaydet"}
+                  </>
+                )}
+              </Button>
+            </div>
+          </SheetFooter>
+        </form>
+      </SheetContent>
+    </Sheet>
+  );
+}

src/app/(dashboard)/finance/banks/components/banks-client.tsx

@@ -0,0 +1,292 @@
+"use client";
+
+import { useState, useTransition } from "react";
+import {
+  Archive,
+  ArchiveRestore,
+  Building2,
+  Loader2,
+  MoreHorizontal,
+  Pencil,
+  Plus,
+  Trash2,
+} from "lucide-react";
+import { toast } from "sonner";
+
+import { Badge } from "@/components/ui/badge";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent } from "@/components/ui/card";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuSeparator,
+  DropdownMenuTrigger,
+} from "@/components/ui/dropdown-menu";
+import {
+  archiveBankAccountAction,
+  deleteBankAccountAction,
+} from "@/lib/appwrite/bank-account-actions";
+import { formatTRY } from "@/lib/format";
+import { cn } from "@/lib/utils";
+
+import { BankFormSheet } from "./bank-form-sheet";
+import type { BankAccountRow } from "./types";
+
+type Props = { accounts: BankAccountRow[] };
+
+export function BanksClient({ accounts }: Props) {
+  const [formOpen, setFormOpen] = useState(false);
+  const [editing, setEditing] = useState<BankAccountRow | null>(null);
+  const [deleting, setDeleting] = useState<BankAccountRow | null>(null);
+  const [busy, startTransition] = useTransition();
+
+  const active = accounts.filter((a) => !a.archived);
+  const archived = accounts.filter((a) => a.archived);
+  const totalBalance = active.reduce((s, a) => s + a.balance, 0);
+
+  const toggleArchive = (acc: BankAccountRow) => {
+    startTransition(async () => {
+      const fd = new FormData();
+      fd.set("id", acc.id);
+      const result = await archiveBankAccountAction(fd);
+      if (result.ok) {
+        toast.success(acc.archived ? "Hesap geri açıldı." : "Hesap arşivlendi.");
+      } else {
+        toast.error(result.error ?? "İşlem başarısız.");
+      }
+    });
+  };
+
+  const handleDelete = () => {
+    if (!deleting) return;
+    startTransition(async () => {
+      const fd = new FormData();
+      fd.set("id", deleting.id);
+      const result = await deleteBankAccountAction(fd);
+      if (result.ok) {
+        toast.success("Hesap silindi.");
+        setDeleting(null);
+      } else {
+        toast.error(result.error ?? "Silme başarısız.");
+      }
+    });
+  };
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between gap-3">
+        <Card className="flex-1">
+          <CardContent className="p-4">
+            <p className="text-muted-foreground text-xs">Toplam bakiye (aktif hesaplar)</p>
+            <p
+              className={cn(
+                "mt-1 text-2xl font-semibold tabular-nums",
+                totalBalance >= 0 ? "text-emerald-600 dark:text-emerald-400" : "text-red-600 dark:text-red-400",
+              )}
+            >
+              {formatTRY(totalBalance)}
+            </p>
+          </CardContent>
+        </Card>
+        <Button
+          onClick={() => {
+            setEditing(null);
+            setFormOpen(true);
+          }}
+        >
+          <Plus className="size-4" />
+          Yeni hesap
+        </Button>
+      </div>
+
+      {active.length === 0 && archived.length === 0 ? (
+        <Card>
+          <CardContent className="flex flex-col items-center gap-2 py-12 text-center">
+            <Building2 className="text-muted-foreground size-8" />
+            <p className="text-sm">Henüz banka hesabı eklenmemiş.</p>
+            <Button
+              variant="outline"
+              size="sm"
+              onClick={() => {
+                setEditing(null);
+                setFormOpen(true);
+              }}
+            >
+              <Plus className="size-3.5" />
+              İlk hesabı ekle
+            </Button>
+          </CardContent>
+        </Card>
+      ) : (
+        <>
+          <div className="grid gap-4 md:grid-cols-2 xl:grid-cols-3">
+            {active.map((a) => (
+              <AccountCard
+                key={a.id}
+                account={a}
+                onEdit={() => {
+                  setEditing(a);
+                  setFormOpen(true);
+                }}
+                onArchiveToggle={() => toggleArchive(a)}
+                onDelete={() => setDeleting(a)}
+                busy={busy}
+              />
+            ))}
+          </div>
+
+          {archived.length > 0 && (
+            <details className="group">
+              <summary className="text-muted-foreground hover:text-foreground cursor-pointer text-sm">
+                Arşivlenmiş hesaplar ({archived.length})
+              </summary>
+              <div className="mt-4 grid gap-4 md:grid-cols-2 xl:grid-cols-3">
+                {archived.map((a) => (
+                  <AccountCard
+                    key={a.id}
+                    account={a}
+                    onEdit={() => {
+                      setEditing(a);
+                      setFormOpen(true);
+                    }}
+                    onArchiveToggle={() => toggleArchive(a)}
+                    onDelete={() => setDeleting(a)}
+                    busy={busy}
+                  />
+                ))}
+              </div>
+            </details>
+          )}
+        </>
+      )}
+
+      <BankFormSheet
+        open={formOpen}
+        onOpenChange={(v) => {
+          setFormOpen(v);
+          if (!v) setEditing(null);
+        }}
+        account={editing}
+      />
+
+      <Dialog open={Boolean(deleting)} onOpenChange={(v) => !v && setDeleting(null)}>
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>Hesabı sil</DialogTitle>
+            <DialogDescription>
+              <strong>{deleting?.bankName} — {deleting?.accountName}</strong> kalıcı olarak silinecek.
+              Bağlı finans hareketi varsa silme reddedilir; o durumda arşivlemeyi tercih edin.
+            </DialogDescription>
+          </DialogHeader>
+          <DialogFooter>
+            <Button variant="outline" onClick={() => setDeleting(null)} disabled={busy}>
+              Vazgeç
+            </Button>
+            <Button variant="destructive" onClick={handleDelete} disabled={busy}>
+              {busy ? <Loader2 className="size-4 animate-spin" /> : <Trash2 className="size-4" />}
+              Sil
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+    </div>
+  );
+}
+
+function AccountCard({
+  account,
+  onEdit,
+  onArchiveToggle,
+  onDelete,
+  busy,
+}: {
+  account: BankAccountRow;
+  onEdit: () => void;
+  onArchiveToggle: () => void;
+  onDelete: () => void;
+  busy: boolean;
+}) {
+  const positive = account.balance >= 0;
+  return (
+    <Card className={cn(account.archived && "opacity-60")}>
+      <CardContent className="space-y-3 p-4">
+        <div className="flex items-start justify-between gap-2">
+          <div className="min-w-0">
+            <div className="flex items-center gap-2">
+              <Building2 className="text-muted-foreground size-4 shrink-0" />
+              <h3 className="truncate font-medium">{account.bankName}</h3>
+              {account.archived && (
+                <Badge variant="outline" className="text-[10px]">
+                  Arşivli
+                </Badge>
+              )}
+            </div>
+            <p className="text-muted-foreground mt-0.5 truncate text-sm">{account.accountName}</p>
+            {account.iban && (
+              <p className="text-muted-foreground mt-1 truncate font-mono text-[11px]">
+                {account.iban.replace(/(.{4})/g, "$1 ").trim()}
+              </p>
+            )}
+          </div>
+          <DropdownMenu>
+            <DropdownMenuTrigger asChild>
+              <Button variant="ghost" size="icon" className="size-8 shrink-0" disabled={busy}>
+                <MoreHorizontal className="size-4" />
+              </Button>
+            </DropdownMenuTrigger>
+            <DropdownMenuContent align="end">
+              <DropdownMenuItem onClick={onEdit}>
+                <Pencil className="size-3.5" />
+                Düzenle
+              </DropdownMenuItem>
+              <DropdownMenuItem onClick={onArchiveToggle}>
+                {account.archived ? (
+                  <>
+                    <ArchiveRestore className="size-3.5" />
+                    Arşivden çıkar
+                  </>
+                ) : (
+                  <>
+                    <Archive className="size-3.5" />
+                    Arşivle
+                  </>
+                )}
+              </DropdownMenuItem>
+              <DropdownMenuSeparator />
+              <DropdownMenuItem variant="destructive" onClick={onDelete}>
+                <Trash2 className="size-3.5" />
+                Sil
+              </DropdownMenuItem>
+            </DropdownMenuContent>
+          </DropdownMenu>
+        </div>
+
+        <div>
+          <p className="text-muted-foreground text-xs">Güncel bakiye</p>
+          <p
+            className={cn(
+              "text-xl font-semibold tabular-nums",
+              positive ? "text-emerald-600 dark:text-emerald-400" : "text-red-600 dark:text-red-400",
+            )}
+          >
+            {formatTRY(account.balance)}
+          </p>
+          {account.balance !== account.openingBalance && (
+            <p className="text-muted-foreground mt-0.5 text-[11px]">
+              Açılış: {formatTRY(account.openingBalance)}
+            </p>
+          )}
+        </div>
+      </CardContent>
+    </Card>
+  );
+}

src/app/(dashboard)/finance/banks/components/types.ts

@@ -0,0 +1,10 @@
+export type BankAccountRow = {
+  id: string;
+  bankName: string;
+  accountName: string;
+  iban: string;
+  openingBalance: number;
+  notes: string;
+  archived: boolean;
+  balance: number;
+};

src/app/(dashboard)/finance/banks/page.tsx

@@ -0,0 +1,52 @@
+import type { Metadata } from "next";
+import { redirect } from "next/navigation";
+
+import {
+  getBankAccountBalances,
+  listBankAccounts,
+} from "@/lib/appwrite/bank-account-queries";
+import { requireTenant } from "@/lib/appwrite/tenant-guard";
+import { BanksClient } from "./components/banks-client";
+
+export const metadata: Metadata = {
+  title: "İşletmem — Banka hesapları",
+};
+
+export default async function BanksPage() {
+  let ctx;
+  try {
+    ctx = await requireTenant();
+  } catch {
+    redirect("/onboarding");
+  }
+
+  const [accounts, balances] = await Promise.all([
+    listBankAccounts(ctx.tenantId),
+    getBankAccountBalances(ctx.tenantId),
+  ]);
+
+  return (
+    <div className="flex-1 space-y-6 px-6 pt-0">
+      <div className="flex flex-col gap-1">
+        <p className="text-muted-foreground text-sm">{ctx.settings?.companyName ?? "Çalışma alanı"}</p>
+        <h1 className="text-2xl font-bold tracking-tight">Banka hesapları</h1>
+        <p className="text-muted-foreground text-sm">
+          İşletmenize ait banka hesaplarını ve güncel bakiyelerini takip edin.
+        </p>
+      </div>
+
+      <BanksClient
+        accounts={accounts.map((a) => ({
+          id: a.$id,
+          bankName: a.bankName,
+          accountName: a.accountName,
+          iban: a.iban ?? "",
+          openingBalance: a.openingBalance ?? 0,
+          notes: a.notes ?? "",
+          archived: Boolean(a.archived),
+          balance: balances.get(a.$id) ?? a.openingBalance ?? 0,
+        }))}
+      />
+    </div>
+  );
+}

src/app/(dashboard)/finance/components/finance-client.tsx

@@ -65,6 +65,7 @@ import { cn } from "@/lib/utils";
 
 import { FinanceFormSheet } from "./finance-form-sheet";
 import {
+  type BankAccountOption,
   type Customer,
   type FinanceRow,
   type FinanceType,
@@ -76,6 +77,7 @@ import {
 type Props = {
   entries: FinanceRow[];
   customers: Customer[];
+  bankAccounts: BankAccountOption[];
 };
 
 function StatCard({
@@ -109,7 +111,7 @@ function StatCard({
   );
 }
 
-export function FinanceClient({ entries, customers }: Props) {
+export function FinanceClient({ entries, customers, bankAccounts }: Props) {
   const [tab, setTab] = useState<FinanceType | "all">("all");
   const [search, setSearch] = useState("");
   const [sorting, setSorting] = useState<SortingState>([]);
@@ -398,6 +400,7 @@ export function FinanceClient({ entries, customers }: Props) {
         entry={editing}
         defaultType={defaultType}
         customers={customers}
+        bankAccounts={bankAccounts}
         onRequestDelete={(e) => {
           setFormOpen(false);
           setDeleting(e);

src/app/(dashboard)/finance/components/finance-form-sheet.tsx

@@ -29,7 +29,7 @@ import {
 } from "@/lib/appwrite/finance-actions";
 import { initialFinanceState } from "@/lib/appwrite/finance-types";
 
-import type { Customer, FinanceRow, FinanceType } from "./types";
+import type { BankAccountOption, Customer, FinanceRow, FinanceType } from "./types";
 
 const NONE = "__none__";
 
@@ -39,6 +39,7 @@ type Props = {
   entry?: FinanceRow | null;
   defaultType?: FinanceType;
   customers: Customer[];
+  bankAccounts: BankAccountOption[];
   onRequestDelete?: (entry: FinanceRow) => void;
 };
 
@@ -53,6 +54,7 @@ export function FinanceFormSheet({
   entry,
   defaultType = "income",
   customers,
+  bankAccounts,
   onRequestDelete,
 }: Props) {
   const isEdit = Boolean(entry);
@@ -83,7 +85,7 @@ export function FinanceFormSheet({
 
         <form
           action={(fd) => {
-            ["customerId", "paymentMethod"].forEach((k) => {
+            ["customerId", "paymentMethod", "bankAccountId"].forEach((k) => {
               if (fd.get(k) === NONE) fd.set(k, "");
             });
             formAction(fd);
@@ -158,21 +160,43 @@ export function FinanceFormSheet({
               </div>
             </div>
 
-            <div className="grid gap-2">
-              <Label htmlFor="customerId">Müşteri (opsiyonel)</Label>
-              <Select name="customerId" defaultValue={entry?.customerId || NONE}>
-                <SelectTrigger id="customerId">
-                  <SelectValue placeholder="Yok" />
-                </SelectTrigger>
-                <SelectContent>
-                  <SelectItem value={NONE}>Yok</SelectItem>
-                  {customers.map((c) => (
-                    <SelectItem key={c.id} value={c.id}>
-                      {c.name}
-                    </SelectItem>
-                  ))}
-                </SelectContent>
-              </Select>
+            <div className="grid gap-4 md:grid-cols-2">
+              <div className="grid gap-2">
+                <Label htmlFor="customerId">Müşteri (opsiyonel)</Label>
+                <Select name="customerId" defaultValue={entry?.customerId || NONE}>
+                  <SelectTrigger id="customerId">
+                    <SelectValue placeholder="Yok" />
+                  </SelectTrigger>
+                  <SelectContent>
+                    <SelectItem value={NONE}>Yok</SelectItem>
+                    {customers.map((c) => (
+                      <SelectItem key={c.id} value={c.id}>
+                        {c.name}
+                      </SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
+              </div>
+              <div className="grid gap-2">
+                <Label htmlFor="bankAccountId">Banka hesabı</Label>
+                <Select
+                  name="bankAccountId"
+                  defaultValue={entry?.bankAccountId || NONE}
+                  disabled={bankAccounts.length === 0}
+                >
+                  <SelectTrigger id="bankAccountId">
+                    <SelectValue placeholder={bankAccounts.length === 0 ? "Önce hesap ekleyin" : "Yok"} />
+                  </SelectTrigger>
+                  <SelectContent>
+                    <SelectItem value={NONE}>Yok</SelectItem>
+                    {bankAccounts.map((b) => (
+                      <SelectItem key={b.id} value={b.id}>
+                        {b.label}
+                      </SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
+              </div>
             </div>
 
             <div className="grid gap-2">

src/app/(dashboard)/finance/components/types.ts

@@ -11,9 +11,12 @@ export type FinanceRow = {
   customerName: string;
   paymentMethod: PaymentMethod;
   invoiceId: string;
+  bankAccountId: string;
+  bankAccountLabel: string;
 };
 
 export type Customer = { id: string; name: string };
+export type BankAccountOption = { id: string; label: string };
 
 export const TYPE_LABEL: Record<FinanceType, string> = {
   income: "Gelir",

src/app/(dashboard)/finance/page.tsx

@@ -1,6 +1,7 @@
 import type { Metadata } from "next";
 import { redirect } from "next/navigation";
 
+import { listBankAccounts } from "@/lib/appwrite/bank-account-queries";
 import { listCustomers } from "@/lib/appwrite/customer-queries";
 import { listFinanceEntries } from "@/lib/appwrite/finance-queries";
 import { requireTenant } from "@/lib/appwrite/tenant-guard";
@@ -18,12 +19,16 @@ export default async function FinancePage() {
     redirect("/onboarding");
   }
 
-  const [entries, customers] = await Promise.all([
+  const [entries, customers, bankAccounts] = await Promise.all([
     listFinanceEntries(ctx.tenantId),
     listCustomers(ctx.tenantId),
+    listBankAccounts(ctx.tenantId),
   ]);
 
   const customerMap = new Map(customers.map((c) => [c.$id, c.name]));
+  const bankMap = new Map(
+    bankAccounts.map((b) => [b.$id, `${b.bankName} — ${b.accountName}`]),
+  );
 
   return (
     <div className="flex-1 space-y-6 px-6 pt-0">
@@ -46,8 +51,16 @@ export default async function FinancePage() {
           customerName: e.customerId ? customerMap.get(e.customerId) ?? "" : "",
           paymentMethod: e.paymentMethod ?? "",
           invoiceId: e.invoiceId ?? "",
+          bankAccountId: e.bankAccountId ?? "",
+          bankAccountLabel: e.bankAccountId ? bankMap.get(e.bankAccountId) ?? "" : "",
         }))}
         customers={customers.map((c) => ({ id: c.$id, name: c.name }))}
+        bankAccounts={bankAccounts
+          .filter((b) => !b.archived)
+          .map((b) => ({
+            id: b.$id,
+            label: `${b.bankName} — ${b.accountName}`,
+          }))}
       />
     </div>
   );

src/components/app-sidebar.tsx

@@ -85,6 +85,16 @@ const navGroups = [
         url: "/finance",
         icon: Wallet,
       },
+      {
+        title: "Bankalar",
+        url: "/finance/banks",
+        icon: Briefcase,
+        items: [
+          { title: "Banka hesapları", url: "/finance/banks" },
+          { title: "Krediler", url: "/finance/loans" },
+          { title: "Kredi kartları", url: "/finance/cards" },
+        ],
+      },
       {
         title: "Faturalar",
         url: "/invoices",

src/lib/appwrite/bank-account-actions.ts

@@ -0,0 +1,244 @@
+"use server";
+
+import { revalidatePath } from "next/cache";
+import { AppwriteException, ID, Permission, Query, Role } from "node-appwrite";
+import { z } from "zod";
+
+import { logAudit } from "./audit";
+import { DATABASE_ID, TABLES, type BankAccount } from "./schema";
+import { createAdminClient } from "./server";
+import { requireTenant } from "./tenant-guard";
+import type { BankAccountActionState } from "./bank-account-types";
+import { bankAccountSchema } from "@/lib/validation/bank-accounts";
+
+function appwriteError(e: unknown): string {
+  if (e instanceof AppwriteException) return e.message || "Beklenmeyen hata.";
+  return "Bağlantı hatası. Tekrar deneyin.";
+}
+
+function flattenErrors(err: z.ZodError): Record<string, string> {
+  const out: Record<string, string> = {};
+  for (const issue of err.issues) {
+    const key = issue.path.join(".");
+    if (key && !out[key]) out[key] = issue.message;
+  }
+  return out;
+}
+
+function teamRowPermissions(tenantId: string) {
+  return [
+    Permission.read(Role.team(tenantId)),
+    Permission.update(Role.team(tenantId)),
+    Permission.delete(Role.team(tenantId, "owner")),
+    Permission.delete(Role.team(tenantId, "admin")),
+  ];
+}
+
+function pickFormFields(formData: FormData) {
+  return {
+    bankName: String(formData.get("bankName") ?? "").trim(),
+    accountName: String(formData.get("accountName") ?? "").trim(),
+    iban: String(formData.get("iban") ?? "").trim(),
+    openingBalance: String(formData.get("openingBalance") ?? "0"),
+    notes: String(formData.get("notes") ?? "").trim(),
+  };
+}
+
+export async function createBankAccountAction(
+  _prev: BankAccountActionState,
+  formData: FormData,
+): Promise<BankAccountActionState> {
+  let ctx;
+  try {
+    ctx = await requireTenant();
+  } catch {
+    return { ok: false, error: "Yetkiniz yok." };
+  }
+
+  const parsed = bankAccountSchema.safeParse(pickFormFields(formData));
+  if (!parsed.success) {
+    return { ok: false, error: "Form geçersiz.", fieldErrors: flattenErrors(parsed.error) };
+  }
+
+  try {
+    const { tablesDB } = createAdminClient();
+    const row = await tablesDB.createRow(
+      DATABASE_ID,
+      TABLES.bankAccounts,
+      ID.unique(),
+      {
+        tenantId: ctx.tenantId,
+        createdBy: ctx.user.id,
+        ...parsed.data,
+      },
+      teamRowPermissions(ctx.tenantId),
+    );
+
+    await logAudit({
+      tenantId: ctx.tenantId,
+      userId: ctx.user.id,
+      action: "create",
+      entityType: "bank_account",
+      entityId: row.$id,
+      changes: parsed.data,
+    });
+  } catch (e) {
+    return { ok: false, error: appwriteError(e) };
+  }
+
+  revalidatePath("/finance/banks");
+  return { ok: true };
+}
+
+export async function updateBankAccountAction(
+  _prev: BankAccountActionState,
+  formData: FormData,
+): Promise<BankAccountActionState> {
+  const id = String(formData.get("id") ?? "");
+  if (!id) return { ok: false, error: "ID eksik." };
+
+  let ctx;
+  try {
+    ctx = await requireTenant();
+  } catch {
+    return { ok: false, error: "Yetkiniz yok." };
+  }
+
+  const parsed = bankAccountSchema.safeParse(pickFormFields(formData));
+  if (!parsed.success) {
+    return { ok: false, error: "Form geçersiz.", fieldErrors: flattenErrors(parsed.error) };
+  }
+
+  try {
+    const { tablesDB } = createAdminClient();
+    const existing = (await tablesDB.getRow(
+      DATABASE_ID,
+      TABLES.bankAccounts,
+      id,
+    )) as unknown as BankAccount;
+    if (existing.tenantId !== ctx.tenantId) {
+      return { ok: false, error: "Erişim engellendi." };
+    }
+
+    await tablesDB.updateRow(DATABASE_ID, TABLES.bankAccounts, id, parsed.data);
+
+    await logAudit({
+      tenantId: ctx.tenantId,
+      userId: ctx.user.id,
+      action: "update",
+      entityType: "bank_account",
+      entityId: id,
+      changes: parsed.data,
+    });
+  } catch (e) {
+    return { ok: false, error: appwriteError(e) };
+  }
+
+  revalidatePath("/finance/banks");
+  return { ok: true };
+}
+
+export async function archiveBankAccountAction(
+  formData: FormData,
+): Promise<BankAccountActionState> {
+  const id = String(formData.get("id") ?? "");
+  if (!id) return { ok: false, error: "ID eksik." };
+
+  let ctx;
+  try {
+    ctx = await requireTenant();
+  } catch {
+    return { ok: false, error: "Yetkiniz yok." };
+  }
+
+  try {
+    const { tablesDB } = createAdminClient();
+    const existing = (await tablesDB.getRow(
+      DATABASE_ID,
+      TABLES.bankAccounts,
+      id,
+    )) as unknown as BankAccount;
+    if (existing.tenantId !== ctx.tenantId) {
+      return { ok: false, error: "Erişim engellendi." };
+    }
+
+    const newArchivedState = !existing.archived;
+    await tablesDB.updateRow(DATABASE_ID, TABLES.bankAccounts, id, {
+      archived: newArchivedState,
+    });
+
+    await logAudit({
+      tenantId: ctx.tenantId,
+      userId: ctx.user.id,
+      action: "update",
+      entityType: "bank_account",
+      entityId: id,
+      changes: { archived: newArchivedState },
+    });
+  } catch (e) {
+    return { ok: false, error: appwriteError(e) };
+  }
+
+  revalidatePath("/finance/banks");
+  return { ok: true };
+}
+
+export async function deleteBankAccountAction(
+  formData: FormData,
+): Promise<BankAccountActionState> {
+  const id = String(formData.get("id") ?? "");
+  if (!id) return { ok: false, error: "ID eksik." };
+
+  let ctx;
+  try {
+    ctx = await requireTenant();
+  } catch {
+    return { ok: false, error: "Yetkiniz yok." };
+  }
+
+  try {
+    const { tablesDB } = createAdminClient();
+    const existing = (await tablesDB.getRow(
+      DATABASE_ID,
+      TABLES.bankAccounts,
+      id,
+    )) as unknown as BankAccount;
+    if (existing.tenantId !== ctx.tenantId) {
+      return { ok: false, error: "Erişim engellendi." };
+    }
+
+    // Block delete if any finance_entry still references this account.
+    const linked = await tablesDB.listRows({
+      databaseId: DATABASE_ID,
+      tableId: TABLES.financeEntries,
+      queries: [
+        Query.equal("tenantId", ctx.tenantId),
+        Query.equal("bankAccountId", id),
+        Query.limit(1),
+      ],
+    });
+    if (linked.rows.length > 0) {
+      return {
+        ok: false,
+        error:
+          "Bu hesaba bağlı finans hareketleri var. Önce hesabı arşivleyin veya hareketleri başka bir hesaba taşıyın.",
+      };
+    }
+
+    await tablesDB.deleteRow(DATABASE_ID, TABLES.bankAccounts, id);
+
+    await logAudit({
+      tenantId: ctx.tenantId,
+      userId: ctx.user.id,
+      action: "delete",
+      entityType: "bank_account",
+      entityId: id,
+      changes: { bankName: existing.bankName, accountName: existing.accountName },
+    });
+  } catch (e) {
+    return { ok: false, error: appwriteError(e) };
+  }
+
+  revalidatePath("/finance/banks");
+  return { ok: true };
+}

src/lib/appwrite/bank-account-queries.ts

@@ -0,0 +1,93 @@
+import "server-only";
+
+import { Query } from "node-appwrite";
+
+import { createAdminClient } from "./server";
+import {
+  DATABASE_ID,
+  TABLES,
+  type BankAccount,
+  type FinanceEntry,
+} from "./schema";
+
+export async function listBankAccounts(tenantId: string): Promise<BankAccount[]> {
+  try {
+    const { tablesDB } = createAdminClient();
+    const result = await tablesDB.listRows({
+      databaseId: DATABASE_ID,
+      tableId: TABLES.bankAccounts,
+      queries: [
+        Query.equal("tenantId", tenantId),
+        Query.orderAsc("bankName"),
+        Query.limit(200),
+      ],
+    });
+    return result.rows as unknown as BankAccount[];
+  } catch {
+    return [];
+  }
+}
+
+/**
+ * Computes a current balance for each account: openingBalance + Σ(income/receivable) − Σ(expense/debt).
+ */
+export async function getBankAccountBalances(
+  tenantId: string,
+): Promise<Map<string, number>> {
+  const balances = new Map<string, number>();
+  try {
+    const { tablesDB } = createAdminClient();
+    const accounts = await tablesDB.listRows({
+      databaseId: DATABASE_ID,
+      tableId: TABLES.bankAccounts,
+      queries: [Query.equal("tenantId", tenantId), Query.limit(200)],
+    });
+    for (const a of accounts.rows as unknown as BankAccount[]) {
+      balances.set(a.$id, a.openingBalance ?? 0);
+    }
+
+    const entries = await tablesDB.listRows({
+      databaseId: DATABASE_ID,
+      tableId: TABLES.financeEntries,
+      queries: [
+        Query.equal("tenantId", tenantId),
+        Query.isNotNull("bankAccountId"),
+        Query.limit(5000),
+      ],
+    });
+    for (const e of entries.rows as unknown as FinanceEntry[]) {
+      if (!e.bankAccountId) continue;
+      const cur = balances.get(e.bankAccountId);
+      if (cur === undefined) continue;
+      if (e.type === "income") balances.set(e.bankAccountId, cur + e.amount);
+      else if (e.type === "expense") balances.set(e.bankAccountId, cur - e.amount);
+      // debt/receivable don't affect cash balance
+    }
+  } catch {
+    /* ignore */
+  }
+  return balances;
+}
+
+export async function listEntriesForAccount(
+  tenantId: string,
+  bankAccountId: string,
+  limit = 25,
+): Promise<FinanceEntry[]> {
+  try {
+    const { tablesDB } = createAdminClient();
+    const result = await tablesDB.listRows({
+      databaseId: DATABASE_ID,
+      tableId: TABLES.financeEntries,
+      queries: [
+        Query.equal("tenantId", tenantId),
+        Query.equal("bankAccountId", bankAccountId),
+        Query.orderDesc("date"),
+        Query.limit(limit),
+      ],
+    });
+    return result.rows as unknown as FinanceEntry[];
+  } catch {
+    return [];
+  }
+}

src/lib/appwrite/bank-account-types.ts

@@ -0,0 +1,7 @@
+export type BankAccountActionState = {
+  ok: boolean;
+  error?: string;
+  fieldErrors?: Record<string, string>;
+};
+
+export const initialBankAccountState: BankAccountActionState = { ok: false };

src/lib/appwrite/finance-actions.ts

@@ -49,6 +49,7 @@ function pickFormFields(formData: FormData) {
       | "check"
       | "other"
       | null,
+    bankAccountId: String(formData.get("bankAccountId") ?? ""),
   };
 }
 

src/lib/appwrite/schema.ts

@@ -13,6 +13,7 @@ export const TABLES = {
   invoiceItems: "invoice_items",
   auditLogs: "audit_logs",
   inviteLinks: "invite_links",
+  bankAccounts: "bank_accounts",
 } as const;
 
 export type TableId = (typeof TABLES)[keyof typeof TABLES];
@@ -133,6 +134,7 @@ export interface FinanceEntry extends Row {
   customerId?: string;
   invoiceId?: string;
   paymentMethod?: PaymentMethod;
+  bankAccountId?: string;
 }
 
 export type InvoiceStatus = "draft" | "sent" | "paid" | "overdue" | "cancelled";
@@ -175,6 +177,17 @@ export interface AuditLog extends Row {
   userAgent?: string;
 }
 
+export interface BankAccount extends Row {
+  tenantId: string;
+  createdBy: string;
+  bankName: string;
+  accountName: string;
+  iban?: string;
+  openingBalance?: number;
+  notes?: string;
+  archived?: boolean;
+}
+
 export type InviteRole = "admin" | "member";
 export type InviteStatus = "pending" | "accepted" | "cancelled" | "expired";
 

src/lib/validation/bank-accounts.ts

@@ -0,0 +1,28 @@
+import { z } from "zod";
+
+export const bankAccountSchema = z.object({
+  bankName: z.string().trim().min(1, "Banka adı zorunlu.").max(100),
+  accountName: z.string().trim().min(1, "Hesap adı zorunlu.").max(100),
+  iban: z
+    .string()
+    .trim()
+    .max(50)
+    .optional()
+    .transform((v) => (v ? v.replace(/\s+/g, "").toUpperCase() : undefined)),
+  openingBalance: z
+    .union([z.number(), z.string()])
+    .optional()
+    .transform((v) => {
+      if (v === undefined || v === "") return 0;
+      const n = typeof v === "string" ? Number(v.replace(",", ".")) : v;
+      return Number.isFinite(n) ? n : 0;
+    }),
+  notes: z
+    .string()
+    .trim()
+    .max(500)
+    .optional()
+    .transform((v) => (v ? v : undefined)),
+});
+
+export type BankAccountInput = z.infer<typeof bankAccountSchema>;

src/lib/validation/finance.ts

@@ -14,6 +14,7 @@ export const financeEntrySchema = z.object({
     .enum(["cash", "transfer", "card", "check", "other"])
     .optional()
     .transform((v) => v || undefined),
+  bankAccountId: z.string().optional().transform((v) => (v ? v : undefined)),
 });
 
 export type FinanceEntryInput = z.infer<typeof financeEntrySchema>;