Task/improve consistency of Ghostfolio AI (#8298)

* Set temperature of models of Ghostfolio AI to 0

* Update changelog

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Changed
+
+- Improved the consistency of the import of activities with _Ghostfolio AI_ (experimental)
+
 ## 3.92.0 - 2026-10-24
 
 ### Changed

apps/api/src/app/endpoints/ai/ai.service.spec.ts

@@ -202,7 +202,7 @@ describe('AiService', () => {
       );
     });
 
-    it('Restricts the routing to endpoints with zero data retention, disables the reasoning and passes a PDF file to the model itself', async () => {
+    it('Restricts the routing to endpoints with zero data retention, disables the reasoning, sets the temperature to 0 and passes a PDF file to the model itself', async () => {
       await aiService.getActivityRowsFromFile({
         file: { buffer: Buffer.from('%PDF-1.7'), mediaType: 'application/pdf' },
         locale: 'de-CH'
@@ -214,6 +214,10 @@ describe('AiService', () => {
         reasoning: { effort: 'none' },
         usage: { include: true }
       });
+
+      expect(generateText).toHaveBeenCalledWith(
+        expect.objectContaining({ temperature: 0 })
+      );
     });
 
     it('Falls back to the general model if no vision model is set', async () => {
@@ -1524,7 +1528,7 @@ describe('AiService', () => {
       );
     });
 
-    it('Restricts the routing to endpoints with zero data retention, disables the reasoning and gives the model no tools', async () => {
+    it('Restricts the routing to endpoints with zero data retention, disables the reasoning, sets the temperature to 0 and gives the model no tools', async () => {
       mockRowMatches({});
 
       await aiService.getActivitiesFromRows({
@@ -1545,7 +1549,8 @@ describe('AiService', () => {
         expect.objectContaining({
           abortSignal,
           model,
-          output: { schema: ROW_MATCHES_OUTPUT }
+          output: { schema: ROW_MATCHES_OUTPUT },
+          temperature: 0
         })
       );
 

apps/api/src/app/endpoints/ai/ai.service.ts

@@ -288,7 +288,8 @@ export class AiService {
    * the rows still have to be matched to asset profiles and accounts. The
    * name of the file is passed as well, as it can name the broker. The
    * reasoning is disabled, as it can add thousands of output tokens even for a
-   * single row. A row above the maximum number of activities is left out. An
+   * single row. The temperature is 0, so that the same file gives the same
+   * rows. A row above the maximum number of activities is left out. An
    * output which reaches the maximum number of output tokens is cut, hence it
    * gives an error for the caller. A cut output without any text is not parsed
    * at all, hence the finish reason is checked as well.
@@ -343,7 +344,8 @@ export class AiService {
           usage: { include: true }
         }
       }),
-      output: Output.object({ schema: ACTIVITY_ROWS_OUTPUT })
+      output: Output.object({ schema: ACTIVITY_ROWS_OUTPUT }),
+      temperature: 0
     }).catch((error: unknown) => {
       if (
         NoObjectGeneratedError.isInstance(error) &&
@@ -551,7 +553,8 @@ export class AiService {
    * the model gets no accounts, so that only the account hints have no match.
    * If the holdings or the data sources cannot be got, the model gets no
    * holdings. The reasoning is disabled, as it can add thousands of output
-   * tokens. An asset match is left out if neither the search of its own asset
+   * tokens. The temperature is 0, so that the same assets give the same
+   * matches. An asset match is left out if neither the search of its own asset
    * nor the holdings gave its asset profile, or if its holding has another ISIN
    * than its own asset, as the import refuses a symbol which the data source
    * cannot resolve and as the model can mix up the ids of the assets. The ISINs
@@ -632,7 +635,8 @@ export class AiService {
         assets: assets.map((asset, index) => {
           return { ...asset, assetProfiles: searches[index].assetProfiles };
         })
-      })
+      }),
+      temperature: 0
     });
 
     const assetMatches = output.assets.filter(({ dataSource, id, symbol }) => {