diff --git a/.gitignore b/.gitignore
index 0d20b64..faeab9b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 *.pyc
+notes/accounting/excel_web_api/.env
diff --git a/modules/purchase_trade/fee.py b/modules/purchase_trade/fee.py
index 4c137c5..90756b2 100755
--- a/modules/purchase_trade/fee.py
+++ b/modules/purchase_trade/fee.py
@@ -216,9 +216,10 @@ class Fee(ModelSQL,ModelView):
             ('origin', 'ilike', '%stock.move%'),
         ])
 
-        logger.info("GET_COG_FEE:%s",ml)
-        if ml:
-            return round(Decimal(sum([e.credit-e.debit for e in ml if e.description != 'Delivery fee'])),2)
+        logger.info("GET_COG_FEE:%s",ml)
+        if ml:
+            return round(Decimal(sum([e.credit-e.debit for e in ml if e.description != 'Delivery fee'])),2)
+        return Decimal(0)
     
     def get_non_cog(self,lot):
         MoveLine = Pool().get('account.move.line')
@@ -233,9 +234,10 @@ class Fee(ModelSQL,ModelView):
             ('account', '=', self.product.account_stock_in_used.id),
         ])
 
-        logger.info("GET_NON_COG_FEE:%s",ml)
-        if ml:
-            return round(Decimal(sum([e.credit-e.debit for e in ml])),2)
+        logger.info("GET_NON_COG_FEE:%s",ml)
+        if ml:
+            return round(Decimal(sum([e.credit-e.debit for e in ml])),2)
+        return Decimal(0)
     
     @classmethod
     def __setup__(cls):
diff --git a/modules/purchase_trade/tests/test_module.py b/modules/purchase_trade/tests/test_module.py
index 7b50eac..f05a697 100644
--- a/modules/purchase_trade/tests/test_module.py
+++ b/modules/purchase_trade/tests/test_module.py
@@ -1181,6 +1181,46 @@ class PurchaseTradeTestCase(ModuleTestCase):
         'fee currency is required for every fee mode'
         self.assertTrue(fee_module.Fee.currency.required)
 
+    def test_fee_get_non_cog_returns_zero_without_move_lines(self):
+        'fee non-cog amount is zero before any accounting move line exists'
+        fee = fee_module.Fee()
+        fee.id = 1
+        fee.product = Mock(account_stock_in_used=Mock(id=2))
+        lot = Mock(id=3)
+        move_line = Mock()
+        move_line.search.return_value = []
+
+        with patch('trytond.modules.purchase_trade.fee.Pool') as PoolMock:
+            PoolMock.return_value.get.side_effect = lambda name: {
+                'account.move.line': move_line,
+                'currency.currency': Mock(),
+                'ir.date': Mock(),
+                'account.configuration': Mock(return_value=Mock()),
+                'product.uom': Mock(),
+            }[name]
+
+            self.assertEqual(fee.get_non_cog(lot), Decimal(0))
+
+    def test_fee_get_cog_returns_zero_without_move_lines(self):
+        'fee cog amount is zero before any stock accounting move line exists'
+        fee = fee_module.Fee()
+        fee.id = 1
+        fee.product = Mock(account_stock_in_used=Mock(id=2))
+        lot = Mock(id=3)
+        move_line = Mock()
+        move_line.search.return_value = []
+
+        with patch('trytond.modules.purchase_trade.fee.Pool') as PoolMock:
+            PoolMock.return_value.get.side_effect = lambda name: {
+                'account.move.line': move_line,
+                'currency.currency': Mock(),
+                'ir.date': Mock(),
+                'account.configuration': Mock(return_value=Mock()),
+                'product.uom': Mock(),
+            }[name]
+
+            self.assertEqual(fee.get_cog(lot), Decimal(0))
+
     def test_valuation_rejects_fee_without_currency_cleanly(self):
         'pnl generation reports a missing fee currency before currency conversion'
         fee = Mock(currency=None, product=Mock(name='Maritime freight'))
diff --git a/modules/purchase_trade/view/sale_line_form.xml b/modules/purchase_trade/view/sale_line_form.xml
index 3e26954..b2678f3 100755
--- a/modules/purchase_trade/view/sale_line_form.xml
+++ b/modules/purchase_trade/view/sale_line_form.xml
@@ -73,7 +73,7 @@ this repository contains the full copyright notices and license terms. -->
         </page>
         <page string="Fees" col="4" id="fees">
             <button name="apply_default_fees" icon="tryton-launch"/>
-            <field name="fees" view_ids="purchase_trade.fee_view_tree_sequence"/>
+            <field name="fees" colspan="4" view_ids="purchase_trade.fee_view_tree_sequence"/>
         </page>
         <page string="Mtm" col="4" id="mtm">
             <field name="mtm" colspan="4"/>
diff --git a/notes/accounting/excel_api/CLIENT_DELIVERY_README.md b/notes/accounting/excel_api/CLIENT_DELIVERY_README.md
new file mode 100644
index 0000000..8352291
--- /dev/null
+++ b/notes/accounting/excel_api/CLIENT_DELIVERY_README.md
@@ -0,0 +1,71 @@
+# GL Accounts Excel API - Client Delivery
+
+## Recommended Files
+
+Send these files to the client:
+
+- `GL_Accounts_Client_Template.xlsx`
+- `GLAccountsExcelApi.bas`
+- `gl_accounts_sql_poc.sql`
+- `GL_Accounts_Functions_Documentation.pdf`
+
+## Why This Package Is Stable
+
+`GL_Accounts_Client_Template.xlsx` is macro-free and contains no active UDF
+formulas. It does not open ODBC connections when the workbook starts, so Excel
+can load it normally even before the client database connection is configured.
+
+The previous `.xlsm` proof-of-concept workbooks are not recommended for client
+delivery because Microsoft 365 may inspect or recalculate embedded VBA/UDF
+formulas while opening the workbook. That can block Excel at `Opening ... 0%`
+if ODBC, macro trust, or the database is not ready.
+
+## Client Setup Flow
+
+1. Apply `gl_accounts_sql_poc.sql` on the target database.
+2. Create a PostgreSQL ODBC System DSN, for example `TradonGLApi`, then
+   configure `GL_API_CONNECTION_STRING` in `GLAccountsExcelApi.bas` as
+   `DSN=TradonGLApi;Uid=tradon_readonly;Pwd=...;`.
+3. Import `GLAccountsExcelApi.bas` into Excel VBA, or deploy it through the
+   client's approved add-in/macro process.
+4. Open `GL_Accounts_Client_Template.xlsx`.
+5. On the `Functions` sheet, run `InstallGLApiFormulas` to mark result cells
+   as ready. This does not write live Excel formulas.
+6. Run `RefreshGLApi` to call the database, write plain result values, then
+   disable database calls again.
+
+## Implemented Excel Functions
+
+- `GetAccountBaseAmount`
+- `GetAccountRealBaseAmount`
+- `GetAccountAmount`
+- `GetAccountAbbr`
+- `GetAccountName`
+- `GetAccountContact`
+- `GetAccountContactCode`
+- `GetAccountContactName`
+
+All functions use:
+
+```excel
+(companyKey, accountCode, currencyIso, valueDate)
+```
+
+## Operational Notes
+
+- `currencyIso` currently filters the transaction currency. It is not yet an
+  output conversion currency.
+- `GetAccountContact` is kept for backward compatibility and returns party
+  code first, name fallback.
+- `GetAccountContactCode` returns party code first.
+- `GetAccountContactName` returns party name first.
+- The VBA module starts with database calls disabled, so copy/paste cannot
+  open ODBC connections by itself.
+- `InstallGLApiFormulas` prepares result cells without creating live
+  `GetAccount...` worksheet formulas.
+- `RefreshGLApi` enables database calls only during the macro execution, clears
+  the cache, evaluates each formula text, writes plain values, then disables
+  database calls again.
+- `ClearGLApiFormulas` removes any live formulas from result cells and replaces
+  them with `#GLAPI_OFF`.
+- `DisableGLApi` turns database calls off again and closes the ODBC connection.
diff --git a/notes/accounting/excel_api/GL_Accounts_Client_Delivery.zip b/notes/accounting/excel_api/GL_Accounts_Client_Delivery.zip
new file mode 100644
index 0000000..b1a872c
Binary files /dev/null and b/notes/accounting/excel_api/GL_Accounts_Client_Delivery.zip differ
diff --git a/notes/accounting/excel_api/GL_Accounts_Client_Template.xlsm b/notes/accounting/excel_api/GL_Accounts_Client_Template.xlsm
new file mode 100644
index 0000000..e1caca6
Binary files /dev/null and b/notes/accounting/excel_api/GL_Accounts_Client_Template.xlsm differ
diff --git a/notes/accounting/excel_api/GL_Accounts_Functions_Documentation.md b/notes/accounting/excel_api/GL_Accounts_Functions_Documentation.md
new file mode 100644
index 0000000..0b7252d
--- /dev/null
+++ b/notes/accounting/excel_api/GL_Accounts_Functions_Documentation.md
@@ -0,0 +1,117 @@
+# GL Accounts Excel Functions
+
+This document lists the Excel functions currently implemented in the GL
+Accounts proof of concept.
+
+## Common Parameters
+
+All functions use the same four parameters:
+
+- `companyKey`: company party code or company party name, for example
+  `ICT TRADING`.
+- `accountCode`: general ledger account code, for example `20011`.
+- `currencyIso`: transaction currency filter. In the current database this may
+  be the currency id, code, name, symbol, or numeric code, for example `1`,
+  `USD`, or `EUR`.
+- `valueDate`: accounting cutoff date. Only posted moves up to this date are
+  included.
+
+Example parameter shape:
+
+```excel
+=GetAccountAmount("ICT TRADING","20011","USD",DATE(2026,5,13))
+```
+
+## Implemented Functions
+
+### GetAccountBaseAmount
+
+```excel
+=GetAccountBaseAmount(companyKey, accountCode, currencyIso, valueDate)
+```
+
+Returns the account balance converted to the company base currency using the
+currency rate at `valueDate`.
+
+### GetAccountRealBaseAmount
+
+```excel
+=GetAccountRealBaseAmount(companyKey, accountCode, currencyIso, valueDate)
+```
+
+Returns the posted balance already stored in company base currency.
+
+### GetAccountAmount
+
+```excel
+=GetAccountAmount(companyKey, accountCode, currencyIso, valueDate)
+```
+
+Returns the posted balance in transaction currency for the selected currency
+filter.
+
+### GetAccountAbbr
+
+```excel
+=GetAccountAbbr(companyKey, accountCode, currencyIso, valueDate)
+```
+
+Returns the account abbreviation. In this POC it returns the account code
+because no separate GL abbreviation field is available.
+
+### GetAccountName
+
+```excel
+=GetAccountName(companyKey, accountCode, currencyIso, valueDate)
+```
+
+Returns the general ledger account name.
+
+### GetAccountContact
+
+```excel
+=GetAccountContact(companyKey, accountCode, currencyIso, valueDate)
+```
+
+Backward-compatible contact formula. It returns contact codes when available,
+otherwise contact names.
+
+### GetAccountContactCode
+
+```excel
+=GetAccountContactCode(companyKey, accountCode, currencyIso, valueDate)
+```
+
+Returns a comma-separated list of contact party codes found on posted GL lines.
+If a party has no code, its name is used as fallback.
+
+### GetAccountContactName
+
+```excel
+=GetAccountContactName(companyKey, accountCode, currencyIso, valueDate)
+```
+
+Returns a comma-separated list of contact party names found on posted GL lines.
+If a party has no name, its code is used as fallback.
+
+## Operational Notes
+
+- Only posted account moves are included.
+- The currency parameter is currently a transaction-currency filter, not an
+  output currency selector.
+- The VBA module caches results. Use `ClearGLApiCache` after changing database
+  data or SQL functions.
+- Database calls are disabled after importing the module and after each
+  refresh. Formula cells return `#GLAPI_OFF` outside `RefreshGLApi`.
+- Use `InstallGLApiFormulas` on the `Functions` sheet to install formulas from
+  formula text into result cells as inert placeholders. Do not remove leading
+  apostrophes manually in Excel's formula bar.
+- Use `ClearGLApiFormulas` if a previous workbook version already contains
+  live `GetAccount...` worksheet formulas.
+- Use `CloseGLApiConnection` to force Excel to reopen the ODBC connection.
+- Use `RefreshGLApi` to enable database calls only during that refresh, clear
+  the cache, evaluate formula text, and write plain values.
+- Use `DisableGLApi` before editing/copying large formula areas if Excel should
+  not contact the database.
+- `GetAccountContact` remains available so existing workbook formulas keep
+  working.
diff --git a/notes/accounting/excel_api/GL_Accounts_Functions_Documentation.pdf b/notes/accounting/excel_api/GL_Accounts_Functions_Documentation.pdf
new file mode 100644
index 0000000..eaab2ec
--- /dev/null
+++ b/notes/accounting/excel_api/GL_Accounts_Functions_Documentation.pdf
@@ -0,0 +1,101 @@
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+/F1 18 Tf 1 0 0 1 50 800 Tm (GL Accounts Excel Functions) Tj
+/F1 10 Tf 1 0 0 1 50 766 Tm (This document lists the Excel functions currently implemented in the GL) Tj
+/F1 10 Tf 1 0 0 1 50 752 Tm (Accounts proof of concept.) Tj
+/F1 14 Tf 1 0 0 1 50 728 Tm (Common Parameters) Tj
+/F1 10 Tf 1 0 0 1 50 698 Tm (All functions use the same four parameters:) Tj
+/F1 10 Tf 1 0 0 1 50 674 Tm (- `companyKey`: company party code or company party name, for example) Tj
+/F1 10 Tf 1 0 0 1 50 660 Tm (  `ICT TRADING`.) Tj
+/F1 10 Tf 1 0 0 1 50 646 Tm (- `accountCode`: general ledger account code, for example `20011`.) Tj
+/F1 10 Tf 1 0 0 1 50 632 Tm (- `currencyIso`: transaction currency filter. In the current database this may) Tj
+/F1 10 Tf 1 0 0 1 50 618 Tm (  be the currency id, code, name, symbol, or numeric code, for example `1`,) Tj
+/F1 10 Tf 1 0 0 1 50 604 Tm (  `USD`, or `EUR`.) Tj
+/F1 10 Tf 1 0 0 1 50 590 Tm (- `valueDate`: accounting cutoff date. Only posted moves up to this date are) Tj
+/F1 10 Tf 1 0 0 1 50 576 Tm (  included.) Tj
+/F1 10 Tf 1 0 0 1 50 552 Tm (Example parameter shape:) Tj
+/F1 9 Tf 1 0 0 1 65 528 Tm (=GetAccountAmount\("ICT TRADING","20011","USD",DATE\(2026,5,13\)\)) Tj
+/F1 14 Tf 1 0 0 1 50 504 Tm (Implemented Functions) Tj
+/F1 12 Tf 1 0 0 1 50 474 Tm (GetAccountBaseAmount) Tj
+/F1 9 Tf 1 0 0 1 65 447 Tm (=GetAccountBaseAmount\(companyKey, accountCode, currencyIso, valueDate\)) Tj
+/F1 10 Tf 1 0 0 1 50 423 Tm (Returns the account balance converted to the company base currency using the) Tj
+/F1 10 Tf 1 0 0 1 50 409 Tm (currency rate at `valueDate`.) Tj
+/F1 12 Tf 1 0 0 1 50 385 Tm (GetAccountRealBaseAmount) Tj
+/F1 9 Tf 1 0 0 1 65 358 Tm (=GetAccountRealBaseAmount\(companyKey, accountCode, currencyIso, valueDate\)) Tj
+/F1 10 Tf 1 0 0 1 50 334 Tm (Returns the posted balance already stored in company base currency.) Tj
+/F1 12 Tf 1 0 0 1 50 310 Tm (GetAccountAmount) Tj
+/F1 9 Tf 1 0 0 1 65 283 Tm (=GetAccountAmount\(companyKey, accountCode, currencyIso, valueDate\)) Tj
+/F1 10 Tf 1 0 0 1 50 259 Tm (Returns the posted balance in transaction currency for the selected currency) Tj
+/F1 10 Tf 1 0 0 1 50 245 Tm (filter.) Tj
+/F1 12 Tf 1 0 0 1 50 221 Tm (GetAccountAbbr) Tj
+/F1 9 Tf 1 0 0 1 65 194 Tm (=GetAccountAbbr\(companyKey, accountCode, currencyIso, valueDate\)) Tj
+/F1 10 Tf 1 0 0 1 50 170 Tm (Returns the account abbreviation. In this POC it returns the account code) Tj
+/F1 10 Tf 1 0 0 1 50 156 Tm (because no separate GL abbreviation field is available.) Tj
+/F1 12 Tf 1 0 0 1 50 132 Tm (GetAccountName) Tj
+/F1 9 Tf 1 0 0 1 65 105 Tm (=GetAccountName\(companyKey, accountCode, currencyIso, valueDate\)) Tj
+/F1 10 Tf 1 0 0 1 50 81 Tm (Returns the general ledger account name.) Tj
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+/F1 12 Tf 1 0 0 1 50 790 Tm (GetAccountContact) Tj
+/F1 9 Tf 1 0 0 1 65 763 Tm (=GetAccountContact\(companyKey, accountCode, currencyIso, valueDate\)) Tj
+/F1 10 Tf 1 0 0 1 50 739 Tm (Backward-compatible contact formula. It returns contact codes when available,) Tj
+/F1 10 Tf 1 0 0 1 50 725 Tm (otherwise contact names.) Tj
+/F1 12 Tf 1 0 0 1 50 701 Tm (GetAccountContactCode) Tj
+/F1 9 Tf 1 0 0 1 65 674 Tm (=GetAccountContactCode\(companyKey, accountCode, currencyIso, valueDate\)) Tj
+/F1 10 Tf 1 0 0 1 50 650 Tm (Returns a comma-separated list of contact party codes found on posted GL lines.) Tj
+/F1 10 Tf 1 0 0 1 50 636 Tm (If a party has no code, its name is used as fallback.) Tj
+/F1 12 Tf 1 0 0 1 50 612 Tm (GetAccountContactName) Tj
+/F1 9 Tf 1 0 0 1 65 585 Tm (=GetAccountContactName\(companyKey, accountCode, currencyIso, valueDate\)) Tj
+/F1 10 Tf 1 0 0 1 50 561 Tm (Returns a comma-separated list of contact party names found on posted GL lines.) Tj
+/F1 10 Tf 1 0 0 1 50 547 Tm (If a party has no name, its code is used as fallback.) Tj
+/F1 14 Tf 1 0 0 1 50 523 Tm (Operational Notes) Tj
+/F1 10 Tf 1 0 0 1 50 493 Tm (- Only posted account moves are included.) Tj
+/F1 10 Tf 1 0 0 1 50 479 Tm (- The currency parameter is currently a transaction-currency filter, not an) Tj
+/F1 10 Tf 1 0 0 1 50 465 Tm (  output currency selector.) Tj
+/F1 10 Tf 1 0 0 1 50 451 Tm (- The VBA module caches results. Use `ClearGLApiCache` after changing database) Tj
+/F1 10 Tf 1 0 0 1 50 437 Tm (  data or SQL functions.) Tj
+/F1 10 Tf 1 0 0 1 50 423 Tm (- Use `CloseGLApiConnection` to force Excel to reopen the ODBC connection.) Tj
+/F1 10 Tf 1 0 0 1 50 409 Tm (- Use `RefreshGLApi` to clear the cache and calculate the active sheet.) Tj
+/F1 10 Tf 1 0 0 1 50 395 Tm (- `GetAccountContact` remains available so existing workbook formulas keep) Tj
+/F1 10 Tf 1 0 0 1 50 381 Tm (  working.) Tj
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diff --git a/notes/accounting/excel_api/GL_Accounts_POC_client_formula_text.xlsx b/notes/accounting/excel_api/GL_Accounts_POC_client_formula_text.xlsx
new file mode 100644
index 0000000..134574c
Binary files /dev/null and b/notes/accounting/excel_api/GL_Accounts_POC_client_formula_text.xlsx differ
diff --git a/notes/accounting/excel_api/Ouvrir_Excel_SafeMode.bat b/notes/accounting/excel_api/Ouvrir_Excel_SafeMode.bat
index efbac0d..365fbe1 100644
--- a/notes/accounting/excel_api/Ouvrir_Excel_SafeMode.bat
+++ b/notes/accounting/excel_api/Ouvrir_Excel_SafeMode.bat
@@ -1,2 +1,2 @@
 @echo off
-start "" "C:\Program Files\Microsoft Office\root\Office16\EXCEL.EXE" /safe "%~dp0GL_Accounts_Client_Template.xlsx"
+start "" "C:\Program Files\Microsoft Office\root\Office16\EXCEL.EXE" /safe "%~dp0GL_Accounts_Client_Template.xlsm"
diff --git a/notes/accounting/excel_web_api/.env.example b/notes/accounting/excel_web_api/.env.example
new file mode 100644
index 0000000..16ffe2c
--- /dev/null
+++ b/notes/accounting/excel_web_api/.env.example
@@ -0,0 +1,5 @@
+DB_HOST=vps107.geneva.hosting
+DB_PORT=5432
+DB_NAME=tradon
+DB_USER=tradon_readonly
+DB_PASSWORD=change_me
diff --git a/notes/accounting/excel_web_api/RefreshGLApi.ts b/notes/accounting/excel_web_api/RefreshGLApi.ts
new file mode 100644
index 0000000..d107ea1
--- /dev/null
+++ b/notes/accounting/excel_web_api/RefreshGLApi.ts
@@ -0,0 +1,109 @@
+/**
+ * GL Accounts refresh — Office Script for Excel Web.
+ *
+ * Setup:
+ *   1. Start the Python API:  uvicorn main:app --port 8000
+ *   2. Expose via ngrok:      ngrok http 8000
+ *   3. Paste the ngrok URL in API_BASE below.
+ *   4. In Excel Web: Automate tab > New Script > paste > Save > Run.
+ *
+ * Sheet layout (GL_Accounts_Client_Template.xlsx):
+ *   Setup!B6  = Company       Functions!C6  = get_account_base_amount
+ *   Setup!B7  = Account       Functions!C7  = get_account_real_base_amount
+ *   Setup!B8  = Currency      Functions!C8  = get_account_amount
+ *   Setup!B9  = Date          Functions!C9  = get_account_abbr
+ *                             Functions!C10 = get_account_name
+ *                             Functions!C11 = get_account_contact
+ *                             Functions!C12 = get_account_contact_code
+ *                             Functions!C13 = get_account_contact_name
+ */
+
+interface GlResults {
+  get_account_base_amount: number;
+  get_account_real_base_amount: number;
+  get_account_amount: number;
+  get_account_abbr: string;
+  get_account_name: string;
+  get_account_contact: string;
+  get_account_contact_code: string;
+  get_account_contact_name: string;
+}
+
+interface GlResponse {
+  results: GlResults;
+  errors: { [key: string]: string };
+}
+
+async function main(workbook: ExcelScript.Workbook): Promise<void> {
+  // ── CONFIG ─────────────────────────────────────────────────────────────────
+  const API_BASE = "https://obscure-boggle-sprig.ngrok-free.dev";
+  // ───────────────────────────────────────────────────────────────────────────
+
+  const setupSheet = workbook.getWorksheet("Setup");
+  const functionsSheet = workbook.getWorksheet("Functions");
+
+  if (!setupSheet || !functionsSheet) {
+    console.log("Error: 'Setup' or 'Functions' sheet not found.");
+    return;
+  }
+
+  const company: string = String(setupSheet.getRange("B6").getValue());
+  const account: string = String(setupSheet.getRange("B7").getValue());
+  const currency: string = String(setupSheet.getRange("B8").getValue());
+  const date: string = toIsoDate(setupSheet.getRange("B9").getValue());
+
+  // Mark as loading
+  for (let row = 6; row <= 13; row++) {
+    functionsSheet.getRange("C" + row).setValue("...");
+  }
+
+  const url = API_BASE + "/gl/all"
+    + "?company="  + encodeURIComponent(company)
+    + "&account="  + encodeURIComponent(account)
+    + "&currency=" + encodeURIComponent(currency)
+    + "&date="     + encodeURIComponent(date);
+
+  let data: GlResponse;
+
+  try {
+    const response = await fetch(url, {
+      headers: { "ngrok-skip-browser-warning": "true" }
+    });
+    if (!response.ok) {
+      throw new Error("HTTP " + response.status);
+    }
+    data = (await response.json()) as GlResponse;
+  } catch (err) {
+    console.log("API call failed: " + err);
+    for (let row = 6; row <= 13; row++) {
+      functionsSheet.getRange("C" + row).setValue("#API_ERROR");
+    }
+    return;
+  }
+
+  const r = data.results;
+  functionsSheet.getRange("C6").setValue(r.get_account_base_amount !== null ? r.get_account_base_amount : "");
+  functionsSheet.getRange("C7").setValue(r.get_account_real_base_amount !== null ? r.get_account_real_base_amount : "");
+  functionsSheet.getRange("C8").setValue(r.get_account_amount !== null ? r.get_account_amount : "");
+  functionsSheet.getRange("C9").setValue(r.get_account_abbr !== null ? r.get_account_abbr : "");
+  functionsSheet.getRange("C10").setValue(r.get_account_name !== null ? r.get_account_name : "");
+  functionsSheet.getRange("C11").setValue(r.get_account_contact !== null ? r.get_account_contact : "");
+  functionsSheet.getRange("C12").setValue(r.get_account_contact_code !== null ? r.get_account_contact_code : "");
+  functionsSheet.getRange("C13").setValue(r.get_account_contact_name !== null ? r.get_account_contact_name : "");
+
+  console.log("Refreshed: " + company + " / " + account + " / " + currency + " / " + date);
+}
+
+function toIsoDate(value: string | number | boolean): string {
+  if (typeof value === "number") {
+    // Excel date serial → YYYY-MM-DD
+    const d = new Date(Date.UTC(1899, 11, 30) + value * 86400000);
+    return d.toISOString().split("T")[0];
+  }
+  const s = String(value);
+  const d = new Date(s);
+  if (!isNaN(d.getTime())) {
+    return d.toISOString().split("T")[0];
+  }
+  return s;
+}
diff --git a/notes/accounting/excel_web_api/main.py b/notes/accounting/excel_web_api/main.py
new file mode 100644
index 0000000..9f69a1c
--- /dev/null
+++ b/notes/accounting/excel_web_api/main.py
@@ -0,0 +1,262 @@
+"""
+GL Accounts API — backend for Excel Web Office Script.
+
+Architecture:
+    Excel Web (Office Script) → HTTP GET /gl/all → this API → PostgreSQL on vps107.geneva.hosting
+
+Run locally:
+    pip install -r requirements.txt
+    uvicorn main:app --reload --port 8000
+
+Expose for Excel Web (Office Scripts run on Microsoft servers, need a public URL):
+    ngrok http 8000
+    → copy the https://xxxx.ngrok.io URL into the Office Script API_BASE constant
+"""
+
+from fastapi import FastAPI, HTTPException, Query, Request
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import HTMLResponse, PlainTextResponse
+from dotenv import load_dotenv
+import psycopg2
+import os
+
+load_dotenv()
+
+app = FastAPI(title="GL Accounts API")
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],       # Excel Web / Office Scripts need open CORS for POC
+    allow_methods=["GET"],
+    allow_headers=["*"],
+)
+
+DB_CONFIG = {
+    "host":     os.getenv("DB_HOST",     "vps107.geneva.hosting"),
+    "port":     int(os.getenv("DB_PORT", "5432")),
+    "dbname":   os.getenv("DB_NAME",     "tradon"),
+    "user":     os.getenv("DB_USER",     "tradon_readonly"),
+    "password": os.getenv("DB_PASSWORD", "change_me"),
+    "connect_timeout": 10,
+}
+
+# Ordered list used by the Office Script to map rows 6-13 in the Functions sheet
+GL_FUNCTIONS = [
+    "get_account_base_amount",
+    "get_account_real_base_amount",
+    "get_account_amount",
+    "get_account_abbr",
+    "get_account_name",
+    "get_account_contact",
+    "get_account_contact_code",
+    "get_account_contact_name",
+]
+
+
+def run_query(function_name: str, company: str, account: str, currency: str, value_date: str):
+    with psycopg2.connect(**DB_CONFIG) as conn:
+        with conn.cursor() as cur:
+            cur.execute(
+                f"SELECT excel_api.{function_name}(%s, %s, %s, %s::date)",
+                (company, account, currency, value_date),
+            )
+            row = cur.fetchone()
+            return row[0] if row and row[0] is not None else None
+
+
+@app.get("/gl/all")
+def get_all(
+    company:  str = Query(..., description="Company party code or name"),
+    account:  str = Query(..., description="GL account code"),
+    currency: str = Query(..., description="Currency code / name / id"),
+    date:     str = Query(..., description="Cutoff date YYYY-MM-DD"),
+):
+    """
+    Returns all 8 GL function results in one round-trip.
+    Called by the Office Script RefreshGLApi.ts.
+    """
+    if function_name_invalid := [f for f in GL_FUNCTIONS if f not in GL_FUNCTIONS]:
+        raise HTTPException(400, f"Unknown function: {function_name_invalid}")
+
+    results: dict = {}
+    errors: dict = {}
+
+    for fn in GL_FUNCTIONS:
+        try:
+            results[fn] = run_query(fn, company, account, currency, date)
+        except Exception as e:
+            results[fn] = None
+            errors[fn] = str(e)
+
+    return {"results": results, "errors": errors or None}
+
+
+@app.get("/health")
+def health():
+    try:
+        with psycopg2.connect(**DB_CONFIG) as conn:
+            with conn.cursor() as cur:
+                cur.execute("SELECT 1")
+        return {"status": "ok", "db": "connected"}
+    except Exception as e:
+        raise HTTPException(503, f"DB unreachable: {e}")
+
+
+# ── Excel Custom Functions Add-in ────────────────────────────────────────────
+
+ADDIN_GUID = "3F4A8B2C-9D1E-4F5A-B6C7-8D9E0F1A2B3C"
+
+
+@app.get("/addin/icon.png")
+def addin_icon():
+    # Minimal 1x1 green PNG
+    import base64
+    png = base64.b64decode(
+        "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg=="
+    )
+    from fastapi.responses import Response
+    return Response(content=png, media_type="image/png")
+
+
+@app.get("/addin/manifest.xml", response_class=PlainTextResponse)
+def addin_manifest(request: Request):
+    base = str(request.base_url).rstrip("/")
+    xml = f"""<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<OfficeApp xmlns="http://schemas.microsoft.com/office/appforoffice/1.1"
+           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+           xmlns:bt="http://schemas.microsoft.com/office/officeappbasictypes/1.0"
+           xsi:type="TaskPaneApp">
+  <Id>{ADDIN_GUID}</Id>
+  <Version>1.0.0.0</Version>
+  <ProviderName>Tradon</ProviderName>
+  <DefaultLocale>en-US</DefaultLocale>
+  <DisplayName DefaultValue="Tradon GL API"/>
+  <Description DefaultValue="GL account functions backed by PostgreSQL"/>
+  <IconUrl DefaultValue="{base}/addin/icon.png"/>
+  <HighResolutionIconUrl DefaultValue="{base}/addin/icon.png"/>
+  <SupportUrl DefaultValue="https://vps107.geneva.hosting"/>
+  <AppDomains>
+    <AppDomain>{base}</AppDomain>
+  </AppDomains>
+  <Hosts>
+    <Host Name="Workbook"/>
+  </Hosts>
+  <DefaultSettings>
+    <SourceLocation DefaultValue="{base}/addin/taskpane.html"/>
+  </DefaultSettings>
+  <Permissions>ReadWriteDocument</Permissions>
+  <VersionOverrides xmlns="http://schemas.microsoft.com/office/taskpaneappversionoverrides"
+                    xmlns:bt="http://schemas.microsoft.com/office/officeappbasictypes/1.0"
+                    xsi:type="VersionOverridesV1_0">
+    <Hosts>
+      <Host xsi:type="Workbook">
+        <AllFormFactors>
+          <ExtensionPoint xsi:type="CustomFunctions">
+            <Script>
+              <SourceLocation resid="Functions.Script.Url"/>
+            </Script>
+            <Page>
+              <SourceLocation resid="Functions.Page.Url"/>
+            </Page>
+            <Metadata>
+              <SourceLocation resid="Functions.Metadata.Url"/>
+            </Metadata>
+            <Namespace resid="Functions.Namespace"/>
+          </ExtensionPoint>
+        </AllFormFactors>
+      </Host>
+    </Hosts>
+    <Resources>
+      <bt:Urls>
+        <bt:Url id="Functions.Script.Url"   DefaultValue="{base}/addin/functions.js"/>
+        <bt:Url id="Functions.Page.Url"     DefaultValue="{base}/addin/functions.html"/>
+        <bt:Url id="Functions.Metadata.Url" DefaultValue="{base}/addin/functions.json"/>
+      </bt:Urls>
+      <bt:ShortStrings>
+        <bt:String id="Functions.Namespace" DefaultValue="TRADON"/>
+      </bt:ShortStrings>
+    </Resources>
+  </VersionOverrides>
+</OfficeApp>"""
+    return PlainTextResponse(content=xml, media_type="application/xml")
+
+
+@app.get("/addin/functions.html", response_class=HTMLResponse)
+def addin_functions_html():
+    return HTMLResponse("""<!DOCTYPE html><html><head>
+<script src="https://appsforoffice.microsoft.com/lib/1/hosted/office.js"></script>
+<script src="/addin/functions.js"></script>
+</head><body></body></html>""")
+
+
+@app.get("/addin/taskpane.html", response_class=HTMLResponse)
+def addin_taskpane():
+    return HTMLResponse("""<!DOCTYPE html><html><head>
+<script src="https://appsforoffice.microsoft.com/lib/1/hosted/office.js"></script>
+</head><body><p>Tradon GL API Add-in loaded.</p></body></html>""")
+
+
+@app.get("/addin/functions.json")
+def addin_functions_json():
+    functions = [
+        ("GET_ACCOUNT_BASE_AMOUNT",      "get_account_base_amount",      "Balance converted to base currency"),
+        ("GET_ACCOUNT_REAL_BASE_AMOUNT", "get_account_real_base_amount", "Posted balance in base currency"),
+        ("GET_ACCOUNT_AMOUNT",           "get_account_amount",           "Balance in transaction currency"),
+        ("GET_ACCOUNT_ABBR",             "get_account_abbr",             "Account abbreviation/code"),
+        ("GET_ACCOUNT_NAME",             "get_account_name",             "Account name"),
+        ("GET_ACCOUNT_CONTACT",          "get_account_contact",          "Contact (code or name)"),
+        ("GET_ACCOUNT_CONTACT_CODE",     "get_account_contact_code",     "Contact party codes"),
+        ("GET_ACCOUNT_CONTACT_NAME",     "get_account_contact_name",     "Contact party names"),
+    ]
+    params = [
+        {"name": "company",  "dimensionality": "scalar", "type": "string"},
+        {"name": "account",  "dimensionality": "scalar", "type": "string"},
+        {"name": "currency", "dimensionality": "scalar", "type": "string"},
+        {"name": "date",     "dimensionality": "scalar", "type": "string"},
+    ]
+    return {
+        "functions": [
+            {"id": fn_id, "name": fn_id, "description": desc,
+             "parameters": params, "result": {"dimensionality": "scalar", "type": "string"}}
+            for fn_id, _, desc in functions
+        ]
+    }
+
+
+@app.get("/addin/functions.js", response_class=PlainTextResponse)
+def addin_functions_js(request: Request):
+    base = str(request.base_url).rstrip("/")
+    js = f"""/* Tradon GL Custom Functions — auto-generated, base={base} */
+const _API = "{base}";
+const _HDR = {{"ngrok-skip-browser-warning": "true"}};
+
+async function _gl(fn, company, account, currency, date) {{
+  const url = _API + "/gl/all?company=" + encodeURIComponent(company)
+    + "&account=" + encodeURIComponent(account)
+    + "&currency=" + encodeURIComponent(currency)
+    + "&date=" + encodeURIComponent(date);
+  const r = await fetch(url, {{headers: _HDR}});
+  if (!r.ok) throw new Error("HTTP " + r.status);
+  const d = await r.json();
+  const v = d.results[fn];
+  return v !== null && v !== undefined ? v : "";
+}}
+
+CustomFunctions.associate("GET_ACCOUNT_BASE_AMOUNT",
+  (c,a,u,d) => _gl("get_account_base_amount", c,a,u,d));
+CustomFunctions.associate("GET_ACCOUNT_REAL_BASE_AMOUNT",
+  (c,a,u,d) => _gl("get_account_real_base_amount", c,a,u,d));
+CustomFunctions.associate("GET_ACCOUNT_AMOUNT",
+  (c,a,u,d) => _gl("get_account_amount", c,a,u,d));
+CustomFunctions.associate("GET_ACCOUNT_ABBR",
+  (c,a,u,d) => _gl("get_account_abbr", c,a,u,d));
+CustomFunctions.associate("GET_ACCOUNT_NAME",
+  (c,a,u,d) => _gl("get_account_name", c,a,u,d));
+CustomFunctions.associate("GET_ACCOUNT_CONTACT",
+  (c,a,u,d) => _gl("get_account_contact", c,a,u,d));
+CustomFunctions.associate("GET_ACCOUNT_CONTACT_CODE",
+  (c,a,u,d) => _gl("get_account_contact_code", c,a,u,d));
+CustomFunctions.associate("GET_ACCOUNT_CONTACT_NAME",
+  (c,a,u,d) => _gl("get_account_contact_name", c,a,u,d));
+"""
+    return PlainTextResponse(content=js, media_type="application/javascript")
diff --git a/notes/accounting/excel_web_api/manifest.xml b/notes/accounting/excel_web_api/manifest.xml
new file mode 100644
index 0000000..f733dec
--- /dev/null
+++ b/notes/accounting/excel_web_api/manifest.xml
@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<OfficeApp xmlns="http://schemas.microsoft.com/office/appforoffice/1.1"
+           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+           xsi:type="TaskPaneApp">
+  <Id>3F4A8B2C-9D1E-4F5A-B6C7-8D9E0F1A2B3C</Id>
+  <Version>1.0.0.0</Version>
+  <ProviderName>Tradon</ProviderName>
+  <DefaultLocale>en-US</DefaultLocale>
+  <DisplayName DefaultValue="Tradon GL API"/>
+  <Description DefaultValue="GL account functions backed by PostgreSQL"/>
+  <Hosts>
+    <Host Name="Workbook"/>
+  </Hosts>
+  <DefaultSettings>
+    <SourceLocation DefaultValue="https://obscure-boggle-sprig.ngrok-free.dev/addin/taskpane.html"/>
+  </DefaultSettings>
+  <Permissions>ReadWriteDocument</Permissions>
+  <VersionOverrides xmlns="http://schemas.microsoft.com/office/taskpaneappversionoverrides" xsi:type="VersionOverridesV1_0">
+    <Hosts>
+      <Host xsi:type="Workbook">
+        <AllFormFactors>
+          <ExtensionPoint xsi:type="CustomFunctions">
+            <Script>
+              <SourceLocation resid="Functions.Script.Url"/>
+            </Script>
+            <Page>
+              <SourceLocation resid="Functions.Page.Url"/>
+            </Page>
+            <Metadata>
+              <SourceLocation resid="Functions.Metadata.Url"/>
+            </Metadata>
+            <Namespace resid="Functions.Namespace"/>
+          </ExtensionPoint>
+        </AllFormFactors>
+      </Host>
+    </Hosts>
+    <Resources>
+      <bt:Urls>
+        <bt:Url id="Functions.Script.Url"   DefaultValue="https://obscure-boggle-sprig.ngrok-free.dev/addin/functions.js"/>
+        <bt:Url id="Functions.Page.Url"     DefaultValue="https://obscure-boggle-sprig.ngrok-free.dev/addin/functions.html"/>
+        <bt:Url id="Functions.Metadata.Url" DefaultValue="https://obscure-boggle-sprig.ngrok-free.dev/addin/functions.json"/>
+      </bt:Urls>
+      <bt:ShortStrings>
+        <bt:String id="Functions.Namespace" DefaultValue="TRADON"/>
+      </bt:ShortStrings>
+    </Resources>
+  </VersionOverrides>
+</OfficeApp>
\ No newline at end of file
diff --git a/notes/accounting/excel_web_api/requirements.txt b/notes/accounting/excel_web_api/requirements.txt
new file mode 100644
index 0000000..555264e
--- /dev/null
+++ b/notes/accounting/excel_web_api/requirements.txt
@@ -0,0 +1,4 @@
+fastapi==0.115.0
+uvicorn[standard]==0.30.0
+psycopg2-binary==2.9.9
+python-dotenv==1.0.1