/* Embedded SQL Schema for C Nostr Relay
 * Generated from db/schema.sql - Do not edit manually
 * Schema Version: 3
 */
#ifndef SQL_SCHEMA_H
#define SQL_SCHEMA_H

/* Schema version constant */
#define EMBEDDED_SCHEMA_VERSION "3"

/* Embedded SQL schema as C string literal */
static const char* const EMBEDDED_SCHEMA_SQL = 
"-- C Nostr Relay Database Schema\n\
-- SQLite schema for storing Nostr events with JSON tags support\n\
\n\
-- Schema version tracking\n\
PRAGMA user_version = 3;\n\
\n\
-- Enable foreign key support\n\
PRAGMA foreign_keys = ON;\n\
\n\
-- Optimize for performance\n\
PRAGMA journal_mode = WAL;\n\
PRAGMA synchronous = NORMAL;\n\
PRAGMA cache_size = 10000;\n\
\n\
-- Core events table with hybrid single-table design\n\
CREATE TABLE events (\n\
    id TEXT PRIMARY KEY,                -- Nostr event ID (hex string)\n\
    pubkey TEXT NOT NULL,               -- Public key of event author (hex string)\n\
    created_at INTEGER NOT NULL,       -- Event creation timestamp (Unix timestamp)\n\
    kind INTEGER NOT NULL,              -- Event kind (0-65535)\n\
    event_type TEXT NOT NULL CHECK (event_type IN ('regular', 'replaceable', 'ephemeral', 'addressable')),\n\
    content TEXT NOT NULL,              -- Event content (text content only)\n\
    sig TEXT NOT NULL,                  -- Event signature (hex string)\n\
    tags JSON NOT NULL DEFAULT '[]',   -- Event tags as JSON array\n\
    first_seen INTEGER NOT NULL DEFAULT (strftime('%s', 'now'))  -- When relay received event\n\
);\n\
\n\
-- Core performance indexes\n\
CREATE INDEX idx_events_pubkey ON events(pubkey);\n\
CREATE INDEX idx_events_kind ON events(kind);\n\
CREATE INDEX idx_events_created_at ON events(created_at DESC);\n\
CREATE INDEX idx_events_event_type ON events(event_type);\n\
\n\
-- Composite indexes for common query patterns\n\
CREATE INDEX idx_events_kind_created_at ON events(kind, created_at DESC);\n\
CREATE INDEX idx_events_pubkey_created_at ON events(pubkey, created_at DESC);\n\
CREATE INDEX idx_events_pubkey_kind ON events(pubkey, kind);\n\
\n\
-- Schema information table\n\
CREATE TABLE schema_info (\n\
    key TEXT PRIMARY KEY,\n\
    value TEXT NOT NULL,\n\
    updated_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now'))\n\
);\n\
\n\
-- Insert schema metadata\n\
INSERT INTO schema_info (key, value) VALUES\n\
    ('version', '3'),\n\
    ('description', 'Hybrid single-table Nostr relay schema with JSON tags and configuration management'),\n\
    ('created_at', strftime('%s', 'now'));\n\
\n\
-- Helper views for common queries\n\
CREATE VIEW recent_events AS\n\
SELECT id, pubkey, created_at, kind, event_type, content\n\
FROM events\n\
WHERE event_type != 'ephemeral'\n\
ORDER BY created_at DESC\n\
LIMIT 1000;\n\
\n\
CREATE VIEW event_stats AS\n\
SELECT \n\
    event_type,\n\
    COUNT(*) as count,\n\
    AVG(length(content)) as avg_content_length,\n\
    MIN(created_at) as earliest,\n\
    MAX(created_at) as latest\n\
FROM events\n\
GROUP BY event_type;\n\
\n\
-- Optimization: Trigger for automatic cleanup of ephemeral events older than 1 hour\n\
CREATE TRIGGER cleanup_ephemeral_events\n\
    AFTER INSERT ON events\n\
    WHEN NEW.event_type = 'ephemeral'\n\
BEGIN\n\
    DELETE FROM events \n\
    WHERE event_type = 'ephemeral' \n\
    AND first_seen < (strftime('%s', 'now') - 3600);\n\
END;\n\
\n\
-- Replaceable event handling trigger\n\
CREATE TRIGGER handle_replaceable_events\n\
    AFTER INSERT ON events\n\
    WHEN NEW.event_type = 'replaceable'\n\
BEGIN\n\
    DELETE FROM events \n\
    WHERE pubkey = NEW.pubkey \n\
    AND kind = NEW.kind \n\
    AND event_type = 'replaceable'\n\
    AND id != NEW.id;\n\
END;\n\
\n\
-- Persistent Subscriptions Logging Tables (Phase 2)\n\
-- Optional database logging for subscription analytics and debugging\n\
\n\
-- Subscription events log\n\
CREATE TABLE subscription_events (\n\
    id INTEGER PRIMARY KEY AUTOINCREMENT,\n\
    subscription_id TEXT NOT NULL,           -- Subscription ID from client\n\
    client_ip TEXT NOT NULL,                 -- Client IP address\n\
    event_type TEXT NOT NULL CHECK (event_type IN ('created', 'closed', 'expired', 'disconnected')),\n\
    filter_json TEXT,                        -- JSON representation of filters (for created events)\n\
    events_sent INTEGER DEFAULT 0,           -- Number of events sent to this subscription\n\
    created_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now')),\n\
    ended_at INTEGER,                        -- When subscription ended (for closed/expired/disconnected)\n\
    duration INTEGER                         -- Computed: ended_at - created_at\n\
);\n\
\n\
-- Subscription metrics summary\n\
CREATE TABLE subscription_metrics (\n\
    id INTEGER PRIMARY KEY AUTOINCREMENT,\n\
    date TEXT NOT NULL,                      -- Date (YYYY-MM-DD)\n\
    total_created INTEGER DEFAULT 0,         -- Total subscriptions created\n\
    total_closed INTEGER DEFAULT 0,          -- Total subscriptions closed\n\
    total_events_broadcast INTEGER DEFAULT 0, -- Total events broadcast\n\
    avg_duration REAL DEFAULT 0,            -- Average subscription duration\n\
    peak_concurrent INTEGER DEFAULT 0,       -- Peak concurrent subscriptions\n\
    updated_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now')),\n\
    UNIQUE(date)\n\
);\n\
\n\
-- Event broadcasting log (optional, for detailed analytics)\n\
CREATE TABLE event_broadcasts (\n\
    id INTEGER PRIMARY KEY AUTOINCREMENT,\n\
    event_id TEXT NOT NULL,                  -- Event ID that was broadcast\n\
    subscription_id TEXT NOT NULL,           -- Subscription that received it\n\
    client_ip TEXT NOT NULL,                 -- Client IP\n\
    broadcast_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now')),\n\
    FOREIGN KEY (event_id) REFERENCES events(id)\n\
);\n\
\n\
-- Indexes for subscription logging performance\n\
CREATE INDEX idx_subscription_events_id ON subscription_events(subscription_id);\n\
CREATE INDEX idx_subscription_events_type ON subscription_events(event_type);\n\
CREATE INDEX idx_subscription_events_created ON subscription_events(created_at DESC);\n\
CREATE INDEX idx_subscription_events_client ON subscription_events(client_ip);\n\
\n\
CREATE INDEX idx_subscription_metrics_date ON subscription_metrics(date DESC);\n\
\n\
CREATE INDEX idx_event_broadcasts_event ON event_broadcasts(event_id);\n\
CREATE INDEX idx_event_broadcasts_sub ON event_broadcasts(subscription_id);\n\
CREATE INDEX idx_event_broadcasts_time ON event_broadcasts(broadcast_at DESC);\n\
\n\
-- Trigger to update subscription duration when ended\n\
CREATE TRIGGER update_subscription_duration\n\
    AFTER UPDATE OF ended_at ON subscription_events\n\
    WHEN NEW.ended_at IS NOT NULL AND OLD.ended_at IS NULL\n\
BEGIN\n\
    UPDATE subscription_events\n\
    SET duration = NEW.ended_at - NEW.created_at\n\
    WHERE id = NEW.id;\n\
END;\n\
\n\
-- View for subscription analytics\n\
CREATE VIEW subscription_analytics AS\n\
SELECT\n\
    date(created_at, 'unixepoch') as date,\n\
    COUNT(*) as subscriptions_created,\n\
    COUNT(CASE WHEN ended_at IS NOT NULL THEN 1 END) as subscriptions_ended,\n\
    AVG(CASE WHEN duration IS NOT NULL THEN duration END) as avg_duration_seconds,\n\
    MAX(events_sent) as max_events_sent,\n\
    AVG(events_sent) as avg_events_sent,\n\
    COUNT(DISTINCT client_ip) as unique_clients\n\
FROM subscription_events\n\
GROUP BY date(created_at, 'unixepoch')\n\
ORDER BY date DESC;\n\
\n\
-- View for current active subscriptions (from log perspective)\n\
CREATE VIEW active_subscriptions_log AS\n\
SELECT\n\
    subscription_id,\n\
    client_ip,\n\
    filter_json,\n\
    events_sent,\n\
    created_at,\n\
    (strftime('%s', 'now') - created_at) as duration_seconds\n\
FROM subscription_events\n\
WHERE event_type = 'created'\n\
AND subscription_id NOT IN (\n\
    SELECT subscription_id FROM subscription_events\n\
    WHERE event_type IN ('closed', 'expired', 'disconnected')\n\
);\n\
\n\
-- ================================\n\
-- CONFIGURATION MANAGEMENT TABLES\n\
-- ================================\n\
\n\
-- Core server configuration table\n\
CREATE TABLE config (\n\
    key TEXT PRIMARY KEY,                    -- Configuration key (unique identifier)\n\
    value TEXT NOT NULL,                     -- Configuration value (stored as string)\n\
    description TEXT,                        -- Human-readable description\n\
    config_type TEXT DEFAULT 'user' CHECK (config_type IN ('system', 'user', 'runtime')),\n\
    data_type TEXT DEFAULT 'string' CHECK (data_type IN ('string', 'integer', 'boolean', 'json')),\n\
    validation_rules TEXT,                   -- JSON validation rules (optional)\n\
    is_sensitive INTEGER DEFAULT 0,          -- 1 if value should be masked in logs\n\
    requires_restart INTEGER DEFAULT 0,      -- 1 if change requires server restart\n\
    created_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now')),\n\
    updated_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now'))\n\
);\n\
\n\
-- Configuration change history table\n\
CREATE TABLE config_history (\n\
    id INTEGER PRIMARY KEY AUTOINCREMENT,\n\
    config_key TEXT NOT NULL,               -- Key that was changed\n\
    old_value TEXT,                         -- Previous value (NULL for new keys)\n\
    new_value TEXT NOT NULL,                -- New value\n\
    changed_by TEXT DEFAULT 'system',       -- Who made the change (system/admin/user)\n\
    change_reason TEXT,                     -- Optional reason for change\n\
    changed_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now')),\n\
    FOREIGN KEY (config_key) REFERENCES config(key)\n\
);\n\
\n\
-- Configuration validation errors log\n\
CREATE TABLE config_validation_log (\n\
    id INTEGER PRIMARY KEY AUTOINCREMENT,\n\
    config_key TEXT NOT NULL,\n\
    attempted_value TEXT,\n\
    validation_error TEXT NOT NULL,\n\
    error_source TEXT DEFAULT 'validation',  -- validation/parsing/constraint\n\
    attempted_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now'))\n\
);\n\
\n\
-- Cache for file-based configuration events\n\
CREATE TABLE config_file_cache (\n\
    file_path TEXT PRIMARY KEY,             -- Full path to config file\n\
    file_hash TEXT NOT NULL,                -- SHA256 hash of file content\n\
    event_id TEXT,                          -- Nostr event ID from file\n\
    event_pubkey TEXT,                      -- Admin pubkey that signed event\n\
    loaded_at INTEGER NOT NULL DEFAULT (strftime('%s', 'now')),\n\
    validation_status TEXT CHECK (validation_status IN ('valid', 'invalid', 'unverified')),\n\
    validation_error TEXT                   -- Error details if invalid\n\
);\n\
\n\
-- Performance indexes for configuration tables\n\
CREATE INDEX idx_config_type ON config(config_type);\n\
CREATE INDEX idx_config_updated ON config(updated_at DESC);\n\
CREATE INDEX idx_config_history_key ON config_history(config_key);\n\
CREATE INDEX idx_config_history_time ON config_history(changed_at DESC);\n\
CREATE INDEX idx_config_validation_key ON config_validation_log(config_key);\n\
CREATE INDEX idx_config_validation_time ON config_validation_log(attempted_at DESC);\n\
\n\
-- Trigger to update timestamp on configuration changes\n\
CREATE TRIGGER update_config_timestamp\n\
    AFTER UPDATE ON config\n\
BEGIN\n\
    UPDATE config SET updated_at = strftime('%s', 'now') WHERE key = NEW.key;\n\
END;\n\
\n\
-- Trigger to log configuration changes to history\n\
CREATE TRIGGER log_config_changes\n\
    AFTER UPDATE ON config\n\
    WHEN OLD.value != NEW.value\n\
BEGIN\n\
    INSERT INTO config_history (config_key, old_value, new_value, changed_by, change_reason)\n\
    VALUES (NEW.key, OLD.value, NEW.value, 'system', 'configuration update');\n\
END;\n\
\n\
-- Active Configuration View\n\
CREATE VIEW active_config AS\n\
SELECT\n\
    key,\n\
    value,\n\
    description,\n\
    config_type,\n\
    data_type,\n\
    requires_restart,\n\
    updated_at\n\
FROM config\n\
WHERE config_type IN ('system', 'user')\n\
ORDER BY config_type, key;\n\
\n\
-- Runtime Statistics View\n\
CREATE VIEW runtime_stats AS\n\
SELECT\n\
    key,\n\
    value,\n\
    description,\n\
    updated_at\n\
FROM config\n\
WHERE config_type = 'runtime'\n\
ORDER BY key;\n\
\n\
-- Configuration Change Summary\n\
CREATE VIEW recent_config_changes AS\n\
SELECT\n\
    ch.config_key,\n\
    sc.description,\n\
    ch.old_value,\n\
    ch.new_value,\n\
    ch.changed_by,\n\
    ch.change_reason,\n\
    ch.changed_at\n\
FROM config_history ch\n\
JOIN config sc ON ch.config_key = sc.key\n\
ORDER BY ch.changed_at DESC\n\
LIMIT 50;\n\
\n\
-- Runtime Statistics (initialized by server on startup)\n\
-- These will be populated when configuration system initializes";

#endif /* SQL_SCHEMA_H */