Add flat Tally group master alongside proven ledger master

app/modules/documents/local_agent_runtime/erp_local_agent/__init__.py

@@ -1,2 +1,2 @@
-__version__ = "1.26.7"
+__version__ = "1.26.8"
 AGENT_NAME = "ERP Local Agent"

app/modules/documents/local_agent_runtime/erp_local_agent/accounting_mirror.py

@@ -245,6 +245,53 @@ class AccountingMirrorEngine:
                             value = _text(value)
                         values.append(value)
                     db.execute(f"INSERT INTO {table} ({','.join(names)}) VALUES ({placeholders})", values)
+            # Common flat accounting master table. Keep the original
+            # ledger_master and group_master physical tables intact.
+            db.execute("DROP TABLE IF EXISTS accounting_master_flat")
+            db.execute("""
+                CREATE TABLE accounting_master_flat (
+                    object_type TEXT NOT NULL,
+                    guid TEXT,
+                    name TEXT NOT NULL,
+                    parent TEXT,
+                    opening_balance REAL,
+                    closing_balance REAL
+                )
+            """)
+            db.execute("""
+                INSERT INTO accounting_master_flat(
+                    object_type,guid,name,parent,opening_balance,closing_balance
+                )
+                SELECT
+                    'LEDGER',
+                    COALESCE(ledger_guid,''),
+                    COALESCE(ledger_name,''),
+                    COALESCE(parent_group,''),
+                    opening_balance,
+                    closing_balance
+                FROM ledger_master
+            """)
+            db.execute("""
+                INSERT INTO accounting_master_flat(
+                    object_type,guid,name,parent,opening_balance,closing_balance
+                )
+                SELECT
+                    'GROUP',
+                    COALESCE(master_guid,''),
+                    COALESCE(name,''),
+                    COALESCE(parent,''),
+                    NULL,
+                    NULL
+                FROM group_master
+            """)
+            db.execute(
+                "CREATE INDEX IF NOT EXISTS idx_accounting_master_flat_type_name "
+                "ON accounting_master_flat(object_type,name)"
+            )
+            db.execute(
+                "CREATE INDEX IF NOT EXISTS idx_accounting_master_flat_parent "
+                "ON accounting_master_flat(parent)"
+            )
             db.commit()
         finally:
             db.close()

app/modules/documents/local_agent_runtime/erp_local_agent/mirror_runtime/ERP_Accounting_Mirror_v3_0_1.tdl

@@ -19,6 +19,11 @@
     Fetch         : Name, Parent, GUID, AlterID, OpeningBalance, ClosingBalance, IsRevenue, PartyGSTIN, GSTRegistrationType
     Is ODBC Table : Yes
 
+[Collection : ERPAMFlatGroupMaster]
+    Type          : Group
+    Fetch         : Name, Parent, GUID
+    Is ODBC Table : Yes
+
 [Collection : ERPAMStockMaster]
     Type          : StockItem
     Fetch         : Name, Parent, GUID, AlterID, BaseUnits, OpeningBalance, OpeningValue, GSTApplicable, GSTRepUoM, GSTTypeofSupply, GSTItemHSNCodeEx

app/modules/documents/local_agent_runtime/erp_local_agent/mirror_runtime/TallyAccountingMirrorV301.cs

@@ -95,31 +95,29 @@ class TallyAccountingMirrorV301
         groupSec = 0;
         string path = Path.Combine(outDir, "group_master.csv");
 
-        // Tally's built-in ODBC Groups table is queried on its own connection.
-        // This deliberately avoids a custom Group TDL collection and protects
-        // the proven Ledger/Voucher extraction connection from being disabled.
+        // Flat Group Master uses the same TDL/ODBC pattern as the proven
+        // Ledger Master. It is deliberately queried only AFTER the core mirror
+        // has finished and on a fresh connection, so a Group-side Tally error
+        // can never disable the Ledger/Voucher/Stock extraction connection.
         if (TryExtractFresh(
                 dsn, "GROUP MASTER",
+                "SELECT $GUID,$Name,$Parent FROM ERPAMFlatGroupMaster",
+                path, out groupRows, out groupSec) && groupRows > 0)
+            return true;
+
+        // Compatibility fallback for builds that expose Groups directly.
+        if (TryExtractFresh(
+                dsn, "GROUP MASTER COMPAT",
                 "SELECT $GUID,$Name,$Parent FROM Groups",
                 path, out groupRows, out groupSec) && groupRows > 0)
             return true;
 
-        // Some builds expose the table but not GUID. Name + Parent are all the
-        // ERP needs for recursive Fixed Assets / Capital hierarchy traversal.
         if (TryExtractFresh(
                 dsn, "GROUP MASTER NAME/PARENT",
                 "SELECT $Name,$Parent FROM Groups",
                 path, out groupRows, out groupSec) && groupRows > 0)
             return true;
 
-        // Last compatibility attempt: singular built-in collection/table name,
-        // again on a NEW connection so a rejected query cannot poison the core.
-        if (TryExtractFresh(
-                dsn, "GROUP MASTER COMPAT",
-                "SELECT $GUID,$Name,$Parent FROM Group",
-                path, out groupRows, out groupSec) && groupRows > 0)
-            return true;
-
         WriteEmptyGroupCsv(path);
         Console.WriteLine("GROUP MASTER - NO GROUP ROWS EXTRACTED; CORE MIRROR DATA REMAINS VALID");
         Console.Out.Flush();