v0.4.8 - Implement web server functionality for embedded admin interface - serve HTML/CSS/JS from /api/ endpoint with proper MIME types, CORS headers, and performance optimizations

src/sql_schema.h

@@ -297,6 +297,65 @@ 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\
+-- Database Statistics Views for Admin API\n\
+-- Event kinds distribution view\n\
+CREATE VIEW event_kinds_view AS\n\
+SELECT\n\
+    kind,\n\
+    COUNT(*) as count,\n\
+    ROUND(COUNT(*) * 100.0 / (SELECT COUNT(*) FROM events), 2) as percentage\n\
+FROM events\n\
+GROUP BY kind\n\
+ORDER BY count DESC;\n\
+\n\
+-- Top pubkeys by event count view\n\
+CREATE VIEW top_pubkeys_view AS\n\
+SELECT\n\
+    pubkey,\n\
+    COUNT(*) as event_count,\n\
+    ROUND(COUNT(*) * 100.0 / (SELECT COUNT(*) FROM events), 2) as percentage\n\
+FROM events\n\
+GROUP BY pubkey\n\
+ORDER BY event_count DESC\n\
+LIMIT 10;\n\
+\n\
+-- Time-based statistics view\n\
+CREATE VIEW time_stats_view AS\n\
+SELECT\n\
+    'total' as period,\n\
+    COUNT(*) as total_events,\n\
+    COUNT(DISTINCT pubkey) as unique_pubkeys,\n\
+    MIN(created_at) as oldest_event,\n\
+    MAX(created_at) as newest_event\n\
+FROM events\n\
+UNION ALL\n\
+SELECT\n\
+    '24h' as period,\n\
+    COUNT(*) as total_events,\n\
+    COUNT(DISTINCT pubkey) as unique_pubkeys,\n\
+    MIN(created_at) as oldest_event,\n\
+    MAX(created_at) as newest_event\n\
+FROM events\n\
+WHERE created_at >= (strftime('%s', 'now') - 86400)\n\
+UNION ALL\n\
+SELECT\n\
+    '7d' as period,\n\
+    COUNT(*) as total_events,\n\
+    COUNT(DISTINCT pubkey) as unique_pubkeys,\n\
+    MIN(created_at) as oldest_event,\n\
+    MAX(created_at) as newest_event\n\
+FROM events\n\
+WHERE created_at >= (strftime('%s', 'now') - 604800)\n\
+UNION ALL\n\
+SELECT\n\
+    '30d' as period,\n\
+    COUNT(*) as total_events,\n\
+    COUNT(DISTINCT pubkey) as unique_pubkeys,\n\
+    MIN(created_at) as oldest_event,\n\
+    MAX(created_at) as newest_event\n\
+FROM events\n\
+WHERE created_at >= (strftime('%s', 'now') - 2592000);";
 
 #endif /* SQL_SCHEMA_H */