diff --git a/docs/circuit-list-editor-interactions.md b/docs/circuit-list-editor-interactions.md
index 9e382c4..1acdfd8 100644
--- a/docs/circuit-list-editor-interactions.md
+++ b/docs/circuit-list-editor-interactions.md
@@ -81,6 +81,7 @@ Intent is separated by drag source type:
 - circuit drag (BMK handle):
   - reorder circuits inside same section only
   - cross-section reorder is rejected
+  - the complete section order is validated and stored in one SQLite transaction
 - bulk device row move:
   - supported via multi-selection + drag
 - multi-circuit move:
@@ -103,6 +104,7 @@ Cross-section device moves show confirmation-required feedback before drop. The
 
 - disabled while filters are active
 - undoable via command history
+- each complete section order is stored atomically
 - until applied, sort remains view-only
 
 ## Column Configuration
diff --git a/src/db/repositories/circuit.repository.ts b/src/db/repositories/circuit.repository.ts
index b43c491..c3026dd 100644
--- a/src/db/repositories/circuit.repository.ts
+++ b/src/db/repositories/circuit.repository.ts
@@ -137,6 +137,46 @@ export class CircuitRepository {
       .orderBy(asc(circuits.sortOrder), asc(circuits.equipmentIdentifier));
   }
 
+  updateSortOrdersSafely(sectionId: string, orderedCircuitIds: string[]) {
+    if (orderedCircuitIds.length === 0) {
+      return;
+    }
+    if (new Set(orderedCircuitIds).size !== orderedCircuitIds.length) {
+      throw new Error("Stromkreise dürfen in der Reihenfolge nicht mehrfach vorkommen.");
+    }
+
+    db.transaction((tx) => {
+      const sectionCircuits = tx
+        .select({ id: circuits.id })
+        .from(circuits)
+        .where(eq(circuits.sectionId, sectionId))
+        .all();
+      const sectionCircuitIds = new Set(sectionCircuits.map((circuit) => circuit.id));
+      if (
+        sectionCircuits.length !== orderedCircuitIds.length ||
+        orderedCircuitIds.some((circuitId) => !sectionCircuitIds.has(circuitId))
+      ) {
+        throw new Error("Die Reihenfolge muss alle Stromkreise des Bereichs enthalten.");
+      }
+
+      for (let index = 0; index < orderedCircuitIds.length; index += 1) {
+        const result = tx
+          .update(circuits)
+          .set({ sortOrder: (index + 1) * 10 })
+          .where(
+            and(
+              eq(circuits.sectionId, sectionId),
+              eq(circuits.id, orderedCircuitIds[index])
+            )
+          )
+          .run();
+        if (result.changes !== 1) {
+          throw new Error("Ein Stromkreis wurde vor Abschluss der Sortierung verändert.");
+        }
+      }
+    });
+  }
+
   async updateEquipmentIdentifiersSafely(
     circuitListId: string,
     updates: Array<{ id: string; equipmentIdentifier: string }>,
diff --git a/src/domain/services/circuit-write.service.ts b/src/domain/services/circuit-write.service.ts
index 98ad79c..4da5cd6 100644
--- a/src/domain/services/circuit-write.service.ts
+++ b/src/domain/services/circuit-write.service.ts
@@ -476,32 +476,7 @@ export class CircuitWriteService {
       }
     }
 
-    for (let index = 0; index < input.orderedCircuitIds.length; index += 1) {
-      const circuitId = input.orderedCircuitIds[index];
-      const circuit = sectionCircuits.find((entry) => entry.id === circuitId);
-      if (!circuit) {
-        throw new Error("Invalid circuit id.");
-      }
-      await this.circuitRepository.update(circuit.id, {
-        sectionId: circuit.sectionId,
-        equipmentIdentifier: circuit.equipmentIdentifier,
-        displayName: circuit.displayName ?? undefined,
-        sortOrder: (index + 1) * 10,
-        protectionType: circuit.protectionType ?? undefined,
-        protectionRatedCurrent: circuit.protectionRatedCurrent ?? undefined,
-        protectionCharacteristic: circuit.protectionCharacteristic ?? undefined,
-        cableType: circuit.cableType ?? undefined,
-        cableCrossSection: circuit.cableCrossSection ?? undefined,
-        cableLength: circuit.cableLength ?? undefined,
-        rcdAssignment: circuit.rcdAssignment ?? undefined,
-        terminalDesignation: circuit.terminalDesignation ?? undefined,
-        voltage: circuit.voltage ?? undefined,
-        controlRequirement: circuit.controlRequirement ?? undefined,
-        status: circuit.status ?? undefined,
-        isReserve: Boolean(circuit.isReserve),
-        remark: circuit.remark ?? undefined,
-      });
-    }
+    this.circuitRepository.updateSortOrdersSafely(sectionId, input.orderedCircuitIds);
     return this.circuitRepository.listBySection(sectionId);
   }
 }
diff --git a/tests/circuit-write.rules.test.ts b/tests/circuit-write.rules.test.ts
index 3514202..45d5dc5 100644
--- a/tests/circuit-write.rules.test.ts
+++ b/tests/circuit-write.rules.test.ts
@@ -580,7 +580,7 @@ describe("circuit write service rules", () => {
   });
 
   it("reorders circuits inside one section without renumbering identifiers", async () => {
-    const updates: Array<{ id: string; sortOrder: number; equipmentIdentifier: string }> = [];
+    let safeReorder: { sectionId: string; circuitIds: string[] } | undefined;
     const service = new CircuitWriteService({
       circuitSectionRepository: {
         async findById() {
@@ -595,18 +595,17 @@ describe("circuit write service rules", () => {
             { id: "c3", sectionId: "s1", equipmentIdentifier: "-2F5", sortOrder: 30, isReserve: 1 },
           ] as never[];
         },
-        async update(id: string, payload: { sortOrder: number; equipmentIdentifier: string }) {
-          updates.push({ id, sortOrder: payload.sortOrder, equipmentIdentifier: payload.equipmentIdentifier });
+        updateSortOrdersSafely(sectionId: string, circuitIds: string[]) {
+          safeReorder = { sectionId, circuitIds };
         },
       } as never,
     });
 
     await service.reorderCircuitsInSection("s1", { orderedCircuitIds: ["c3", "c1", "c2"] });
-    assert.deepEqual(updates, [
-      { id: "c3", sortOrder: 10, equipmentIdentifier: "-2F5" },
-      { id: "c1", sortOrder: 20, equipmentIdentifier: "-2F7" },
-      { id: "c2", sortOrder: 30, equipmentIdentifier: "-2F9" },
-    ]);
+    assert.deepEqual(safeReorder, {
+      sectionId: "s1",
+      circuitIds: ["c3", "c1", "c2"],
+    });
   });
 
   it("safe section identifier bulk update validates full section set (undo safety)", async () => {
@@ -698,6 +697,61 @@ describe("circuit write service rules", () => {
     }
   });
 
+  it("safe circuit reorder uses one synchronous transaction callback", () => {
+    const repository = new CircuitRepository();
+    const originalTransaction = (db as unknown as { transaction: unknown }).transaction;
+
+    let callbackReturnedPromise = false;
+    const sortOrders: number[] = [];
+    (db as unknown as { transaction: (cb: (tx: unknown) => unknown) => void }).transaction = (cb) => {
+      const fakeTx = {
+        select() {
+          return {
+            from() {
+              return {
+                where() {
+                  return {
+                    all() {
+                      return [{ id: "c1" }, { id: "c2" }, { id: "c3" }];
+                    },
+                  };
+                },
+              };
+            },
+          };
+        },
+        update() {
+          return {
+            set(values: { sortOrder: number }) {
+              sortOrders.push(values.sortOrder);
+              return {
+                where() {
+                  return {
+                    run() {
+                      return { changes: 1 };
+                    },
+                  };
+                },
+              };
+            },
+          };
+        },
+      };
+      const callbackResult = cb(fakeTx);
+      callbackReturnedPromise = Boolean(
+        callbackResult && typeof (callbackResult as Promise<unknown>).then === "function"
+      );
+    };
+
+    try {
+      repository.updateSortOrdersSafely("s1", ["c3", "c1", "c2"]);
+      assert.equal(callbackReturnedPromise, false);
+      assert.deepEqual(sortOrders, [10, 20, 30]);
+    } finally {
+      (db as unknown as { transaction: unknown }).transaction = originalTransaction;
+    }
+  });
+
   it("bulk device row move uses one synchronous transaction callback", () => {
     const repository = new CircuitDeviceRowRepository();
     const originalTransaction = (db as unknown as { transaction: unknown }).transaction;