feat(plugin/timestamps): add indexStrategy option for entity indexing

Introduced a new `indexStrategy` option in the timestamps plugin to configure index generation for `created_at` and `updated_at` fields. Supports "composite" and "individual" strategies for better control over database indexing. Added test coverage for different index strategies.

app/src/plugins/data/timestamp.plugin.spec.ts

@@ -71,4 +71,54 @@ describe("timestamps plugin", () => {
       expect(updatedData.updated_at).toBeDefined();
       expect(updatedData.updated_at).toBeInstanceOf(Date);
    });
+
+   test("index strategy", async () => {
+      const app = createApp({
+         config: {
+            data: em({
+               posts: entity("posts", {
+                  title: text(),
+               }),
+            }).toJSON(),
+         },
+         options: {
+            plugins: [timestamps({ entities: ["posts"] })],
+         },
+      });
+      await app.build();
+      expect(app.em.indices.length).toBe(0);
+      {
+         const app = createApp({
+            config: {
+               data: em({
+                  posts: entity("posts", {
+                     title: text(),
+                  }),
+               }).toJSON(),
+            },
+            options: {
+               plugins: [timestamps({ entities: ["posts"], indexStrategy: "composite" })],
+            },
+         });
+         await app.build();
+         expect(app.em.indices.length).toBe(1);
+      }
+
+      {
+         const app = createApp({
+            config: {
+               data: em({
+                  posts: entity("posts", {
+                     title: text(),
+                  }),
+               }).toJSON(),
+            },
+            options: {
+               plugins: [timestamps({ entities: ["posts"], indexStrategy: "individual" })],
+            },
+         });
+         await app.build();
+         expect(app.em.indices.length).toBe(2);
+      }
+   });
 });

app/src/plugins/data/timestamps.plugin.ts

@@ -4,6 +4,7 @@ import { $console } from "bknd/utils";
 export type TimestampsPluginOptions = {
    entities: string[];
    setUpdatedOnCreate?: boolean;
+   indexStrategy?: "composite" | "individual";
 };
 
 /**
@@ -19,6 +20,7 @@ export type TimestampsPluginOptions = {
 export function timestamps({
    entities = [],
    setUpdatedOnCreate = true,
+   indexStrategy,
 }: TimestampsPluginOptions): AppPlugin {
    return (app: App) => ({
       name: "timestamps",
@@ -29,12 +31,11 @@ export function timestamps({
          }
 
          const appEntities = app.em.entities.map((e) => e.name);
+         const actualEntities = entities.filter((e) => appEntities.includes(e));
 
          return em(
             Object.fromEntries(
-               entities
+               actualEntities.map((e) => [
-                  .filter((e) => appEntities.includes(e))
-                  .map((e) => [
                   e,
                   entity(e, {
                      created_at: datetime(),
@@ -42,6 +43,23 @@ export function timestamps({
                   }),
                ]),
             ),
+            (fns, schema) => {
+               if (indexStrategy) {
+                  for (const entity of actualEntities) {
+                     if (entity in schema) {
+                        switch (indexStrategy) {
+                           case "composite":
+                              fns.index(schema[entity]!).on(["created_at", "updated_at"]);
+                              break;
+                           case "individual":
+                              fns.index(schema[entity]!).on(["created_at"]);
+                              fns.index(schema[entity]!).on(["updated_at"]);
+                              break;
+                        }
+                     }
+                  }
+               }
+            },
          );
       },
       onBuilt: async () => {