first commit

Backend/schema.sql

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+CREATE EXTENSION IF NOT EXISTS "pgcrypto";
+
+CREATE TABLE IF NOT EXISTS users (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    username TEXT UNIQUE NOT NULL,
+    client_salt TEXT NOT NULL,
+    encrypted_master_key TEXT NOT NULL,
+    hashed_auth_key TEXT NOT NULL,
+    public_identity_key TEXT NOT NULL,
+    public_signing_key TEXT NOT NULL,
+    encrypted_private_keys TEXT NOT NULL, -- Added this column
+    is_admin BOOLEAN DEFAULT FALSE,
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS channels (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    name TEXT UNIQUE NOT NULL,
+    type TEXT DEFAULT 'text',
+    created_at TIMESTAMP DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS roles (
+    id SERIAL PRIMARY KEY,
+    name TEXT NOT NULL,
+    permissions JSONB
+);
+
+CREATE TABLE IF NOT EXISTS channel_keys (
+    channel_id UUID NOT NULL,
+    user_id UUID NOT NULL,
+    encrypted_key_bundle TEXT NOT NULL,
+    key_version INTEGER DEFAULT 1,
+    PRIMARY KEY (channel_id, user_id)
+);
+
+CREATE TABLE IF NOT EXISTS messages (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    channel_id UUID NOT NULL,
+    sender_id UUID NOT NULL,
+    ciphertext TEXT NOT NULL,
+    nonce TEXT NOT NULL,
+    signature TEXT NOT NULL,
+    key_version INTEGER NOT NULL,
+    created_at TIMESTAMP DEFAULT NOW()
+);