# DeBros Network - Distributed P2P Database System

A robust, decentralized peer-to-peer network built in Go, providing distributed SQL database, key-value storage, pub/sub messaging, and resilient peer management. Designed for applications needing reliable, scalable, and secure data sharing without centralized infrastructure.

---

## Table of Contents

- [Features](#features)
- [Architecture Overview](#architecture-overview)
- [System Requirements](#system-requirements)
- [Quick Start](#quick-start)
- [Deployment & Installation](#deployment--installation)
- [Configuration](#configuration)
- [CLI Usage](#cli-usage)
- [HTTP Gateway](#http-gateway)
- [Development](#development)
- [Database Client (Go ORM-like)](#database-client-go-orm-like)
- [Troubleshooting](#troubleshooting)
- [License](#license)

---

## Features

- **Distributed SQL Database:** RQLite-backed, Raft-consensus, ACID transactions, automatic failover.
- **Pub/Sub Messaging:** Topic-based, real-time, namespaced, automatic cleanup.
- **Peer Discovery & Management:** Nodes discover peers, bootstrap support, health monitoring.
- **Application Isolation:** Namespace-based multi-tenancy, per-app config.
- **Secure by Default:** Noise/TLS transport, peer identity, systemd hardening.
- **Simple Client API:** Lightweight Go client for apps and CLI tools.

---

## Architecture Overview

```
┌─────────────────────────────────────────────────────────────┐
│                  DeBros Network Cluster                    │
├─────────────────────────────────────────────────────────────┤
│                   Application Layer                        │
│ ┌─────────────┐ ┌─────────────┐ ┌────────────────────────┐ │
│ │   Anchat    │ │ Custom App  │ │      CLI Tools        │ │
│ └─────────────┘ └─────────────┘ └────────────────────────┘ │
├─────────────────────────────────────────────────────────────┤
│                      Client API                            │
│ ┌─────────────┐ ┌────────────────────────┐               │
│ │  Database   │ │        PubSub         │               │
│ │   Client    │ │        Client         │               │
│ └─────────────┘ └────────────────────────┘               │
├─────────────────────────────────────────────────────────────┤
│                    Network Node Layer                      │
│ ┌─────────────┐ ┌─────────────┐ ┌────────────────────────┐ │
│ │ Discovery   │ │   PubSub    │ │      Database         │ │
│ │  Manager    │ │   Manager   │ │    (RQLite)          │ │
│ └─────────────┘ └─────────────┘ └────────────────────────┘ │
├─────────────────────────────────────────────────────────────┤
│                  Transport Layer                           │
│ ┌─────────────┐ ┌─────────────┐ ┌────────────────────────┐ │
│ │   LibP2P    │ │   Noise/TLS │ │      RQLite           │ │
│ │   Host      │ │  Encryption │ │    Database           │ │
│ └─────────────┘ └─────────────┘ └────────────────────────┘ │
└─────────────────────────────────────────────────────────────┘
```

- **Node:** Full P2P participant, runs services, handles peer discovery, database, pubsub.
- **Client:** Lightweight, connects only to bootstrap peers, consumes services, no peer discovery.

---

## System Requirements

### Software

- **Go:** 1.21+ (recommended)
- **RQLite:** 8.x (distributed SQLite)
- **Git:** For source management
- **Make:** For build automation (recommended)

### Hardware

- **Minimum:** 2 CPU cores, 4GB RAM, 10GB disk, stable internet
- **Recommended:** 4+ cores, 8GB+ RAM, 50GB+ SSD, low-latency network

### Network Ports

- **4001:** LibP2P P2P communication
- **5001:** RQLite HTTP API
- **7001:** RQLite Raft consensus

---

## Quick Start

### 1. Clone and Setup

```bash
git clone https://github.com/DeBrosOfficial/network.git
cd network
```

### 2. Build All Executables

```bash
make build
```

### 3. Start a Bootstrap Node

```bash
make run-node
# Or manually:
go run ./cmd/node --config configs/bootstrap.yaml
```

### 4. Start Additional Nodes

```bash
make run-node2
# Or manually:
go run ./cmd/node --config configs/node.yaml
```

### 5. Test with CLI

```bash
./bin/network-cli health
./bin/network-cli peers
./bin/network-cli pubsub publish notifications "Hello World"
./bin/network-cli pubsub subscribe notifications 10s
```

---

## Deployment & Installation

### Automated Production Install

Run the install script for a secure, production-ready setup:

```bash
curl -sSL https://github.com/DeBrosOfficial/network/raw/main/scripts/install-debros-network.sh | sudo bash
```

**What the Script Does:**
- Detects OS, installs Go, RQLite, dependencies
- Creates `debros` system user, secure directory structure
- Generates LibP2P identity keys
- Clones source, builds binaries
- Sets up systemd service (`debros-node`)
- Configures firewall (UFW) for required ports
- Generates YAML config in `/opt/debros/configs/node.yaml`

**Directory Structure:**
```
/opt/debros/
├── bin/           # Binaries
├── configs/       # YAML configs
├── keys/          # Identity keys
├── data/          # RQLite DB, storage
├── logs/          # Node logs
├── src/           # Source code
```

**Service Management:**
```bash
sudo systemctl status debros-node
sudo systemctl start debros-node
sudo systemctl stop debros-node
sudo systemctl restart debros-node
sudo journalctl -u debros-node.service -f
```

---

## Configuration

### Example Configuration Files

#### `configs/bootstrap.yaml`

```yaml
node:
  id: ""
  listen_addresses:
    - "/ip4/0.0.0.0/tcp/4001"
  data_dir: "./data/bootstrap"
  max_connections: 100

database:
  data_dir: "./data/db"
  replication_factor: 3
  shard_count: 16
  max_database_size: 1073741824
  backup_interval: 24h
  rqlite_port: 5001
  rqlite_raft_port: 7001
  rqlite_join_address: "" # Bootstrap node does not join

discovery:
  bootstrap_peers: []
  discovery_interval: 15s
  bootstrap_port: 4001
  http_adv_address: "127.0.0.1"
  raft_adv_address: ""

security:
  enable_tls: false
  private_key_file: ""
  certificate_file: ""

logging:
  level: "info"
  format: "console"
  output_file: ""
```

#### `configs/node.yaml`

```yaml
node:
  id: "node2"
  listen_addresses:
    - "/ip4/0.0.0.0/tcp/4002"
  data_dir: "./data/node2"
  max_connections: 50

database:
  data_dir: "./data/db"
  replication_factor: 3
  shard_count: 16
  max_database_size: 1073741824
  backup_interval: 24h
  rqlite_port: 5002
  rqlite_raft_port: 7002
  rqlite_join_address: "http://127.0.0.1:5001"

discovery:
  bootstrap_peers:
    - "/ip4/127.0.0.1/tcp/4001/p2p/<YOUR_BOOTSTRAP_PEER_ID>"
  discovery_interval: 15s
  bootstrap_port: 4002
  http_adv_address: "127.0.0.1"
  raft_adv_address: ""

security:
  enable_tls: false
  private_key_file: ""
  certificate_file: ""

logging:
  level: "info"
  format: "console"
  output_file: ""
```

### YAML Reference

#### Node YAML (configs/node.yaml or configs/bootstrap.yaml)

The .yaml files are required in order for the nodes and the gateway to run correctly.

node:
- id (string) Optional node ID. Auto-generated if empty.
- type (string) "bootstrap" or "node". Default: "node".
- listen_addresses (string[]) LibP2P listen multiaddrs. Default: ["/ip4/0.0.0.0/tcp/4001"].
- data_dir (string) Data directory. Default: "./data".
- max_connections (int) Max peer connections. Default: 50.

database:
- data_dir (string) Directory for database files. Default: "./data/db".
- replication_factor (int) Number of replicas. Default: 3.
- shard_count (int) Shards for data distribution. Default: 16.
- max_database_size (int64 bytes) Max DB size. Default: 1073741824 (1GB).
- backup_interval (duration) e.g., "24h". Default: 24h.
- rqlite_port (int) RQLite HTTP API port. Default: 5001.
- rqlite_raft_port (int) RQLite Raft port. Default: 7001.
- rqlite_join_address (string) HTTP address of an existing RQLite node to join. Empty for bootstrap.

discovery:
- bootstrap_peers (string[]) List of LibP2P multiaddrs of bootstrap peers.
- discovery_interval (duration) How often to announce/discover peers. Default: 15s.
- bootstrap_port (int) Default port for bootstrap nodes. Default: 4001.
- http_adv_address (string) Advertised HTTP address for RQLite (host:port).
- raft_adv_address (string) Advertised Raft address (host:port).
- node_namespace (string) Namespace for node identifiers. Default: "default".

security:
- enable_tls (bool) Enable TLS for externally exposed services. Default: false.
- private_key_file (string) Path to TLS private key (if TLS enabled).
- certificate_file (string) Path to TLS certificate (if TLS enabled).

logging:
- level (string) one of "debug", "info", "warn", "error". Default: "info".
- format (string) "json" or "console". Default: "console".
- output_file (string) Empty for stdout; otherwise path to log file.

Precedence (node): Flags > YAML > Defaults.

Example node.yaml

```yaml
node:
  id: "node2"
  listen_addresses:
    - "/ip4/0.0.0.0/tcp/4002"
  data_dir: "./data/node2"
  max_connections: 50
  disable_anonrc: true

database:
  data_dir: "./data/db"
  replication_factor: 3
  shard_count: 16
  max_database_size: 1073741824
  backup_interval: 24h
  rqlite_port: 5001
  rqlite_raft_port: 7001
  rqlite_join_address: "http://127.0.0.1:5001"

discovery:
  bootstrap_peers:
    - "<YOUR_BOOTSTRAP_PEER_ID_MULTIADDR>"
  discovery_interval: 15s
  bootstrap_port: 4001
  http_adv_address: "127.0.0.1"
  raft_adv_address: ""
  node_namespace: "default"

security:
  enable_tls: false
  private_key_file: ""
  certificate_file: ""
  auth_enabled: false

logging:
  level: "info"
  format: "console"
  output_file: ""
```

#### Gateway YAML (configs/gateway.yaml)

- listen_addr (string) HTTP listen address, e.g., ":6001". Default: ":6001".
- client_namespace (string) Namespace used by the gateway client. Default: "default".
- bootstrap_peers (string[]) List of bootstrap peer multiaddrs. Default: empty.

Precedence (gateway): Flags > Environment Variables > YAML > Defaults.
Environment variables:
- GATEWAY_ADDR
- GATEWAY_NAMESPACE
- GATEWAY_BOOTSTRAP_PEERS (comma-separated)

Example gateway.yaml

```yaml
listen_addr: ":6001"
client_namespace: "default"
bootstrap_peers:
  - "<YOUR_BOOTSTRAP_PEER_ID_MULTIADDR>"
```

### Flags & Environment Variables

- **Flags**: Override config at startup (`--data`, `--p2p-port`, `--rqlite-http-port`, etc.)
- **Env Vars**: Override config and flags (`NODE_ID`, `RQLITE_PORT`, `BOOTSTRAP_PEERS`, etc.)
- **Precedence (gateway)**: Flags > Env Vars > YAML > Defaults
- **Precedence (node)**: Flags > YAML > Defaults

### Bootstrap & Database Endpoints

- **Bootstrap peers**: Set in config or via `BOOTSTRAP_PEERS` env var.
- **Database endpoints**: Set in config or via `RQLITE_NODES` env var.
- **Development mode**: Use `NETWORK_DEV_LOCAL=1` for localhost defaults.

---

## CLI Usage

### Network Operations

```bash
./bin/network-cli health                    # Check network health
./bin/network-cli status                    # Get network status
./bin/network-cli peers                     # List connected peers
```



### Database Operations

```bash
./bin/network-cli query "SELECT * FROM table"              # Execute SQL
./bin/network-cli query "CREATE TABLE users (id INTEGER)"  # DDL operations
```

### Pub/Sub Messaging

```bash
./bin/network-cli pubsub publish <topic> <message>     # Send message
./bin/network-cli pubsub subscribe <topic> [duration]  # Listen for messages
./bin/network-cli pubsub topics                        # List active topics
```

### CLI Options

```bash
--format json                 # Output in JSON format
--timeout 30s                 # Set operation timeout
--bootstrap <multiaddr>       # Override bootstrap peer
--production                  # Use production bootstrap peers
```

### Database Operations (Gateway REST)

```http
POST /v1/db/create-table      # Body: {"schema": "CREATE TABLE ..."}
POST /v1/db/drop-table        # Body: {"table": "table_name"}
POST /v1/db/query             # Body: {"sql": "SELECT ...", "args": [..]}
POST /v1/db/transaction       # Body: {"statements": ["SQL 1", "SQL 2", ...]}
GET  /v1/db/schema            # Returns current tables and columns
```

Common migration workflow:

```bash
# Add a new table
curl -X POST "$GW/v1/db/create-table" \
  -H "Authorization: Bearer $API_KEY" -H 'Content-Type: application/json' \
  -d '{"schema":"CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY, name TEXT)"}'

# Apply multiple statements atomically
curl -X POST "$GW/v1/db/transaction" \
  -H "Authorization: Bearer $API_KEY" -H 'Content-Type: application/json' \
  -d '{"statements":[
        "ALTER TABLE users ADD COLUMN email TEXT",
        "CREATE INDEX IF NOT EXISTS idx_users_email ON users(email)"
      ]}'

# Verify
curl -X POST "$GW/v1/db/query" \
  -H "Authorization: Bearer $API_KEY" -H 'Content-Type: application/json' \
  -d '{"sql":"PRAGMA table_info(users)"}'
```

### Authentication

The CLI features an enhanced authentication system with automatic wallet detection and multi-wallet support:

- **Automatic Authentication:** No manual auth commands required - authentication happens automatically when operations need credentials
- **Multi-Wallet Management:** Seamlessly switch between multiple wallet credentials
- **Persistent Sessions:** Wallet credentials are automatically saved and restored between sessions
- **Enhanced User Experience:** Streamlined authentication flow with better error handling and user feedback

When using operations that require authentication (storage, database, pubsub), the CLI will automatically:
1. Check for existing valid credentials
2. Prompt for wallet authentication if needed
3. Handle signature verification
4. Persist credentials for future use

**Example with automatic authentication:**
```bash
# First time - will prompt for wallet authentication when needed
./bin/network-cli pubsub publish notifications "Hello World"
```

---

## HTTP Gateway

The DeBros Network includes a powerful HTTP/WebSocket gateway that provides a modern REST API and WebSocket interface over the P2P network, featuring an enhanced authentication system with multi-wallet support.

### Quick Start

```bash
make run-gateway
# Or manually:
go run ./cmd/gateway
```

### Configuration

The gateway can be configured via configs/gateway.yaml and environment variables (env override YAML):

```bash
# Basic Configuration
export GATEWAY_ADDR="0.0.0.0:6001"
export GATEWAY_NAMESPACE="my-app"
export GATEWAY_BOOTSTRAP_PEERS="/ip4/127.0.0.1/tcp/4001/p2p/YOUR_PEER_ID"

# Authentication Configuration
export GATEWAY_REQUIRE_AUTH=true
export GATEWAY_API_KEYS="key1:namespace1,key2:namespace2"
```

### Enhanced Authentication System

The gateway features a significantly improved authentication system with the following capabilities:

#### Key Features
- **Automatic Authentication:** No manual auth commands required - authentication happens automatically when needed
- **Multi-Wallet Support:** Seamlessly manage multiple wallet credentials with automatic switching
- **Persistent Sessions:** Wallet credentials are automatically saved and restored
- **Enhanced User Experience:** Streamlined authentication flow with better error handling

#### Authentication Methods

**Wallet-Based Authentication (Ethereum EIP-191)**
- Uses `personal_sign` for secure wallet verification
- Supports multiple wallets with automatic detection
- Addresses are case-insensitive with normalized signature handling

**JWT Tokens**
- Issued by the gateway with configurable expiration
- JWKS endpoints available at `/v1/auth/jwks` and `/.well-known/jwks.json`
- Automatic refresh capability

**API Keys**
- Support for pre-configured API keys via `Authorization: Bearer <key>` or `X-API-Key` headers
- Optional namespace mapping for multi-tenant applications

### API Endpoints

#### Health & Status
```http
GET /health                 # Basic health check
GET /v1/health             # Detailed health status
GET /v1/status             # Network status
GET /v1/version            # Version information
```

#### Authentication (Public Endpoints)
```http
POST /v1/auth/challenge    # Generate wallet challenge
POST /v1/auth/verify       # Verify wallet signature
POST /v1/auth/register     # Register new wallet
POST /v1/auth/refresh      # Refresh JWT token
POST /v1/auth/logout       # Clear authentication
GET  /v1/auth/whoami       # Current auth status
POST /v1/auth/api-key      # Generate API key (authenticated)
```



#### Network Operations
```http
GET  /v1/network/status    # Network status
GET  /v1/network/peers     # Connected peers
POST /v1/network/connect   # Connect to peer
POST /v1/network/disconnect # Disconnect from peer
```

#### Pub/Sub Messaging

**WebSocket Interface**
```http
GET /v1/pubsub/ws?topic=<topic>  # WebSocket connection for real-time messaging
```

**REST Interface**
```http
POST /v1/pubsub/publish    # Publish message to topic
GET  /v1/pubsub/topics     # List active topics
```

---

## SDK Authoring Guide

### Base concepts
- OpenAPI: a machine-readable spec is available at `openapi/gateway.yaml` for SDK code generation.
- **Auth**: send `X-API-Key: <key>` or `Authorization: Bearer <key|JWT>` with every request.
- **Versioning**: all endpoints are under `/v1/`.
- **Responses**: mutations return `{status:"ok"}`; queries/lists return JSON; errors return `{ "error": "message" }` with proper HTTP status.

### Key HTTP endpoints for SDKs
- **Database**
  - Create Table: `POST /v1/db/create-table` `{schema}` → `{status:"ok"}`
  - Drop Table: `POST /v1/db/drop-table` `{table}` → `{status:"ok"}`
  - Query: `POST /v1/db/query` `{sql, args?}` → `{columns, rows, count}`
  - Transaction: `POST /v1/db/transaction` `{statements:[...]}` → `{status:"ok"}`
  - Schema: `GET /v1/db/schema` → schema JSON
- **PubSub**
  - WS Subscribe: `GET /v1/pubsub/ws?topic=<topic>`
  - Publish: `POST /v1/pubsub/publish` `{topic, data_base64}` → `{status:"ok"}`
  - Topics: `GET /v1/pubsub/topics` → `{topics:[...]}`

### Migrations
- Add column: `ALTER TABLE users ADD COLUMN age INTEGER`
- Change type / add FK (recreate pattern): create `_new` table, copy data, drop old, rename.
- Always send as one `POST /v1/db/transaction`.

### Minimal examples

TypeScript (Node)

```ts
import { GatewayClient } from "../examples/sdk-typescript/src/client";

const client = new GatewayClient(process.env.GATEWAY_BASE_URL!, process.env.GATEWAY_API_KEY!);
await client.createTable("CREATE TABLE users (id INTEGER PRIMARY KEY, name TEXT)");
const res = await client.query("SELECT name FROM users WHERE id = ?", [1]);
```

Python

```python
import os, requests

BASE = os.environ['GATEWAY_BASE_URL']
KEY  = os.environ['GATEWAY_API_KEY']
H    = { 'X-API-Key': KEY, 'Content-Type': 'application/json' }

def query(sql, args=None):
    r = requests.post(f'{BASE}/v1/db/query', json={ 'sql': sql, 'args': args or [] }, headers=H, timeout=15)
    r.raise_for_status()
    return r.json()['rows']
```

Go

```go
req, _ := http.NewRequest(http.MethodPost, base+"/v1/db/create-table", bytes.NewBufferString(`{"schema":"CREATE TABLE ..."}`))
req.Header.Set("X-API-Key", apiKey)
req.Header.Set("Content-Type", "application/json")
resp, err := http.DefaultClient.Do(req)
```

### Security Features

- **Namespace Enforcement:** All operations are automatically prefixed with namespace for isolation
- **CORS Support:** Configurable CORS policies (permissive for development, configurable for production)
- **Transport Security:** All network communications use Noise/TLS encryption
- **Authentication Middleware:** Flexible authentication with support for multiple credential types

### Usage Examples

#### Wallet Authentication Flow
```bash
# 1. Get challenge (automatic)
curl -X POST http://localhost:6001/v1/auth/challenge

# 2. Sign challenge with wallet (handled by client)
# 3. Verify signature (automatic)
curl -X POST http://localhost:6001/v1/auth/verify \
  -H "Content-Type: application/json" \
  -d '{"wallet":"0x...","nonce":"...","signature":"0x..."}'
```



#### Real-time Messaging
```javascript
// WebSocket connection
const ws = new WebSocket('ws://localhost:6001/v1/pubsub/ws?topic=chat');

ws.onmessage = (event) => {
  console.log('Received:', event.data);
};

// Send message
ws.send('Hello, network!');
```

---

## Development
</text>


### Project Structure

```
network/
├── cmd/
│   ├── node/         # Network node executable
│   └── cli/          # Command-line interface
├── pkg/
│   ├── client/       # Client library
│   ├── node/         # Node implementation
│   ├── database/     # RQLite integration
│   ├── pubsub/       # Pub/Sub messaging
│   ├── config/       # Centralized config
│   └── discovery/    # Peer discovery (node only)
├── scripts/          # Install, test scripts
├── configs/          # YAML configs
├── bin/              # Built executables
```

### Build & Test

```bash
make build           # Build all executables
make test            # Run unit tests
make clean           # Clean build artifacts
```

### Local Multi-Node Testing

```bash
scripts/test-multinode.sh
```

---

## Database Client (Go ORM-like)

A lightweight ORM-like client over rqlite using Go’s `database/sql`. It provides:
- Query/Exec for raw SQL
- A fluent QueryBuilder (`Where`, `InnerJoin`, `LeftJoin`, `OrderBy`, `GroupBy`, `Limit`, `Offset`)
- Simple repositories with `Find`/`FindOne`
- `Save`/`Remove` for entities with primary keys
- Transaction support via `Tx`

### Installation

- Ensure rqlite is running (the node starts and manages rqlite automatically).
- Import the client:
  - Package: `github.com/DeBrosOfficial/network/pkg/rqlite`

### Quick Start

```go
package main

import (
	"context"
	"database/sql"
	"time"

	"github.com/DeBrosOfficial/network/pkg/rqlite"
	_ "github.com/rqlite/gorqlite/stdlib"
)

type User struct {
	ID        int64     `db:"id,pk,auto"`
	Email     string    `db:"email"`
	FirstName string    `db:"first_name"`
	LastName  string    `db:"last_name"`
	CreatedAt time.Time `db:"created_at"`
}

func (User) TableName() string { return "users" }

func main() {
	ctx := context.Background()

	adapter, _ := rqlite.NewRQLiteAdapter(manager)
	client := rqlite.NewClientFromAdapter(adapter)

	// Save (INSERT)
	u := &User{Email: "alice@example.com", FirstName: "Alice", LastName: "A"}
	_ = client.Save(ctx, u) // auto-sets u.ID if autoincrement is available

	// FindOneBy
	var one User
	_ = client.FindOneBy(ctx, &one, "users", map[string]any{"email": "alice@example.com"})

	// QueryBuilder
	var users []User
	_ = client.CreateQueryBuilder("users").
		Where("email LIKE ?", "%@example.com").
		OrderBy("created_at DESC").
		Limit(10).
		GetMany(ctx, &users)
}

### Entities and Mapping

- Use struct tags: `db:"column_name"`; the first tag value is the column name.
- Mark primary key: `db:"id,pk"` (and `auto` if autoincrement): `db:"id,pk,auto"`.
- Fallbacks:
  - If no `db` tag is provided, the field name is used as the column (case-insensitive).
  - If a field is named `ID`, it is treated as the primary key by default.

```go
type Post struct {
	ID        int64     `db:"id,pk,auto"`
	UserID    int64     `db:"user_id"`
	Title     string    `db:"title"`
	Body      string    `db:"body"`
	CreatedAt time.Time `db:"created_at"`
}
func (Post) TableName() string { return "posts" }
```

### Basic queries

Raw SQL with scanning into structs or maps:

```go
var users []User
err := client.Query(ctx, &users, "SELECT id, email, first_name, last_name, created_at FROM users WHERE email LIKE ?", "%@example.com")
if err != nil {
	// handle
}

var rows []map[string]any
_ = client.Query(ctx, &rows, "SELECT id, email FROM users WHERE id IN (?,?)", 1, 2)
```

### Query Buider

Build complex SELECTs with joins, filters, grouping, ordering, and pagination.

```go
var results []User
qb := client.CreateQueryBuilder("users u").
	InnerJoin("posts p", "p.user_id = u.id").
	Where("u.email LIKE ?", "%@example.com").
	AndWhere("p.created_at >= ?", "2024-01-01T00:00:00Z").
	GroupBy("u.id").
	OrderBy("u.created_at DESC").
	Limit(20).
	Offset(0)

if err := qb.GetMany(ctx, &results); err != nil {
	// handle
}

// Single row (LIMIT 1)
var one User
if err := qb.Limit(1).GetOne(ctx, &one); err != nil {
	// handle sql.ErrNoRows, etc.
}
```

### FindBy / FindOneBy

Simple map-based filters:

```go
var active []User
_ = client.FindBy(ctx, &active, "users", map[string]any{"last_name": "A"}, rqlite.WithOrderBy("created_at DESC"), rqlite.WithLimit(50))

var u User
if err := client.FindOneBy(ctx, &u, "users", map[string]any{"email": "alice@example.com"}); err != nil {
	// sql.ErrNoRows if not found
}
```

### Save / Remove

`Save` inserts if PK is zero, otherwise updates by PK.
`Remove` deletes by PK.

```go
// Insert (ID is zero)
u := &User{Email: "bob@example.com", FirstName: "Bob"}
_ = client.Save(ctx, u) // INSERT; sets u.ID if autoincrement

// Update (ID is non-zero)
u.FirstName = "Bobby"
_ = client.Save(ctx, u) // UPDATE ... WHERE id = ?

// Remove
_ = client.Remove(ctx, u) // DELETE ... WHERE id = ?

```

### transactions

Run multiple operations atomically. If your function returns an error, the transaction is rolled back; otherwise it commits.

```go
err := client.Tx(ctx, func(tx rqlite.Tx) error {
	// Read inside the same transaction
	var me User
	if err := tx.Query(ctx, &me, "SELECT * FROM users WHERE id = ?", 1); err != nil {
		return err
	}

	// Write inside the same transaction
	me.LastName = "Updated"
	if err := tx.Save(ctx, &me); err != nil {
		return err
	}

	// Complex query via builder
	var recent []User
	if err := tx.CreateQueryBuilder("users").
		OrderBy("created_at DESC").
		Limit(5).
		GetMany(ctx, &recent); err != nil {
		return err
	}

	return nil // commit
})

```

### Repositories (optional, generic)

Strongly-typed convenience layer bound to a table:

```go
repo := client.Repository[User]("users")

var many []User
_ = repo.Find(ctx, &many, map[string]any{"last_name": "A"}, rqlite.WithOrderBy("created_at DESC"), rqlite.WithLimit(10))

var one User
_ = repo.FindOne(ctx, &one, map[string]any{"email": "alice@example.com"})

_ = repo.Save(ctx, &one)
_ = repo.Remove(ctx, &one)

```

### Migrations

Option A: From the node (after rqlite is ready)

```go
ctx := context.Background()
dirs := []string{
    "network/migrations",           // default
    "path/to/your/app/migrations",  // extra
}

if err := rqliteManager.ApplyMigrationsDirs(ctx, dirs); err != nil {
    logger.Fatal("apply migrations failed", zap.Error(err))
}
```

Option B: Using the adapter sql.DB

```go
ctx := context.Background()
db := adapter.GetSQLDB()
dirs := []string{"network/migrations", "app/migrations"}

if err := rqlite.ApplyMigrationsDirs(ctx, db, dirs, logger); err != nil {
    logger.Fatal("apply migrations failed", zap.Error(err))
}
```


---

## Troubleshooting

### Common Issues

#### Bootstrap Connection Failed

- **Symptoms:** `Failed to connect to bootstrap peer`
- **Solutions:** Check node is running, firewall settings, peer ID validity.

#### Database Operations Timeout

- **Symptoms:** `Query timeout` or `No RQLite connection available`
- **Solutions:** Ensure RQLite ports are open, leader election completed, cluster join config correct.

#### Message Delivery Failures

- **Symptoms:** Messages not received by subscribers
- **Solutions:** Verify topic names, active subscriptions, network connectivity.

#### High Memory Usage

- **Symptoms:** Memory usage grows continuously
- **Solutions:** Unsubscribe when done, monitor connection pool, review message retention.

#### Authentication Issues

- **Symptoms:** `Authentication failed`, `Invalid wallet signature`, `JWT token expired`
- **Solutions:**
  - Check wallet signature format (65-byte r||s||v hex)
  - Ensure nonce matches exactly during wallet verification
  - Verify wallet address case-insensitivity
  - Use refresh endpoint or re-authenticate for expired tokens
  - Clear credential cache if multi-wallet conflicts occur: `rm -rf ~/.debros/credentials`

#### Gateway Issues

- **Symptoms:** `Gateway connection refused`, `CORS errors`, `WebSocket disconnections`
- **Solutions:**
  - Verify gateway is running and accessible on configured port
  - Check CORS configuration for web applications
  - Ensure proper authentication headers for protected endpoints
  - Verify namespace configuration and enforcement

#### Database Migration Issues

- **Symptoms:** `Migration failed`, `SQL syntax error`, `Version conflict`
- **Solutions:**
  - Check SQL syntax in migration files
  - Ensure proper statement termination
  - Verify migration file naming and sequential order
  - Review migration logs for transaction rollbacks

### Debugging & Health Checks

```bash
export LOG_LEVEL=debug
./bin/network-cli health
./bin/network-cli peers
./bin/network-cli query "SELECT 1"
./bin/network-cli pubsub publish test "hello"
./bin/network-cli pubsub subscribe test 10s

# Gateway health checks
curl http://localhost:6001/health
curl http://localhost:6001/v1/status
```

### Service Logs

```bash
# Node service logs
sudo journalctl -u debros-node.service --since "1 hour ago"

# Gateway service logs (if running as service)
sudo journalctl -u debros-gateway.service --since "1 hour ago"

# Application logs
tail -f ./logs/gateway.log
tail -f ./logs/node.log
```

---

## License

Distributed under the MIT License. See [LICENSE](LICENSE) for details.

---

## Further Reading

- [DeBros Network Documentation](https://network.debros.io/docs/)
- [RQLite Documentation](https://github.com/rqlite/rqlite)
- [LibP2P Documentation](https://libp2p.io)

---

_This README reflects the latest architecture, configuration, and operational practices for the DeBros Network. For questions or contributions, please open an issue or pull request._