feat: implement user profiles and social walls (Tasks #171, #173, #174)

server/db.js

@@ -11,6 +11,8 @@ con.exec(`
     CREATE TABLE IF NOT EXISTS users (
         wallet_address VARCHAR PRIMARY KEY,
         username VARCHAR UNIQUE,
+        bio VARCHAR DEFAULT '',
+        banner_color VARCHAR DEFAULT '#6366f1',
         last_seen TIMESTAMP
     );
 
@@ -31,8 +33,17 @@ con.exec(`
         PRIMARY KEY (message_id, wallet_address, emoji),
         FOREIGN KEY (wallet_address) REFERENCES users(wallet_address)
     );
+
+    CREATE TABLE IF NOT EXISTS posts (
+        id INTEGER PRIMARY KEY,
+        wallet_address VARCHAR,
+        content VARCHAR,
+        timestamp TIMESTAMP,
+        FOREIGN KEY (wallet_address) REFERENCES users(wallet_address)
+    );
     
     CREATE SEQUENCE IF NOT EXISTS seq_msg_id START 1;
+    CREATE SEQUENCE IF NOT EXISTS seq_post_id START 1;
 
     -- Migration: Add tx_id to messages if it doesn't exist (for existing DBs)
     PRAGMA table_info('messages');
@@ -46,7 +57,20 @@ con.exec(`
         if (!hasTxId) {
             con.run("ALTER TABLE messages ADD COLUMN tx_id VARCHAR", (err) => {
                 if (err) console.error("Error adding tx_id column:", err);
-                else console.log("Added tx_id column to messages table");
+            });
+        }
+    });
+
+    // Migration: Add bio and banner_color to users
+    con.all("PRAGMA table_info('users')", (err, rows) => {
+        if (err) return;
+        const hasBio = rows.some(r => r.name === 'bio');
+        if (!hasBio) {
+            con.run("ALTER TABLE users ADD COLUMN bio VARCHAR DEFAULT ''", (err) => {
+                if (err) console.error("Error adding bio column:", err);
+            });
+            con.run("ALTER TABLE users ADD COLUMN banner_color VARCHAR DEFAULT '#6366f1'", (err) => {
+                if (err) console.error("Error adding banner_color column:", err);
             });
         }
     });