Support tag history

src/controllers/api/trends.ts

@@ -12,6 +12,7 @@ const trendingTagsController: AppController = (c) => {
 
   const now = new Date();
   const yesterday = new Date(now.getTime() - Time.days(1));
+  const lastWeek = new Date(now.getTime() - Time.days(7));
 
   const tags = trends.getTrendingTags({
     since: yesterday,
@@ -19,14 +20,14 @@ const trendingTagsController: AppController = (c) => {
     limit,
   });
 
-  return c.json(tags.map(({ name, accounts, uses }) => ({
+  return c.json(tags.map(({ name }) => ({
     name,
     url: Conf.local(`/tags/${name}`),
-    history: [{
-      day: String(Math.floor(yesterday.getTime() / 1000)),
-      uses: String(uses),
-      accounts: String(accounts),
-    }],
+    history: trends.getTagHistory(name, lastWeek, now).map((history) => ({
+      day: String(Math.floor(history.day.getTime() / 1000)),
+      accounts: String(history.accounts),
+      uses: String(history.uses),
+    })),
   })));
 };
 

src/trends.ts

@@ -54,6 +54,23 @@ class TrendsDB {
     }));
   }
 
+  getTagHistory(tag: string, since: Date, until: Date) {
+    return this.#db.query<string[]>(
+      `
+      SELECT inserted_at, COUNT(DISTINCT pubkey8), COUNT(*)
+        FROM tag_usages
+        WHERE tag = ? AND inserted_at >= ? AND inserted_at < ?
+        GROUP BY date(inserted_at)
+        ORDER BY date(inserted_at);
+    `,
+      [tag, since, until],
+    ).map((row) => ({
+      day: new Date(row[0]),
+      accounts: Number(row[1]),
+      uses: Number(row[2]),
+    }));
+  }
+
   addTagUsages(pubkey: string, hashtags: string[], date = new Date()): void {
     const pubkey8 = hexIdSchema.parse(pubkey).substring(0, 8);
     const tags = hashtagSchema.array().min(1).parse(hashtags);