peers syncing for a single user

db.js

@@ -3,6 +3,7 @@
 //   name: string;
 //   email: string;
 // }
+// Efficiently storing data in indexdb: https://stackoverflow.com/a/62975917
 const postStoreName = "posts";
 let keyBase = "dandelion_posts_v1_";
 let key = "";
@@ -117,6 +118,50 @@ export async function addDataArray(userID, array) {
         console.error('Error in opening database:', error);
     }
 }
+export async function mergeDataArray(userID, array) {
+    try {
+        const db = await openDatabase(userID);
+        const transaction = db.transaction(postStoreName, "readwrite");
+        const store = transaction.objectStore(postStoreName);
+        const index = store.index("postIDIndex");
+        transaction.oncomplete = () => {
+            console.log("Transaction completed successfully");
+            db.close();
+        };
+        transaction.onerror = (event) => {
+            console.error("Transaction error:", event.target.error);
+            db.close();
+        };
+        let postsToWrite = [];
+        for (let post of array) {
+            try {
+                let havePost = await new Promise((resolve, reject) => {
+                    const getRequest = index.getKey(post.post_id);
+                    getRequest.onerror = (e) => {
+                        console.log(e.target.error);
+                        reject(e);
+                    };
+                    getRequest.onsuccess = async (e) => {
+                        const key = e.target.result;
+                        resolve(key !== undefined);
+                    };
+                });
+                // console.log(post.post_id, havePost);
+                if (!havePost) {
+                    postsToWrite.push(post);
+                }
+            }
+            catch (error) {
+                console.error("Error processing post:", error);
+            }
+        }
+        console.log(`Writing ${postsToWrite.length} posts`);
+        await addDataArray(userID, postsToWrite);
+    }
+    catch (error) {
+        console.error("Error in opening database:", error);
+    }
+}
 export async function getData(userID, lowerID, upperID) {
     const db = await openDatabase(userID);
     const transaction = db.transaction(postStoreName, "readonly");