Standardize all timestamps to UTC ISO-8601 format

- Update schema.sql defaults from datetime('now') to strftime('%Y-%m-%dT%H:%M:%fZ', 'now')
- Update schema-admin.sql with same UTC format
- Update AdminService.js inline table creation and query comparisons
- Update system.js time-based query comparisons
- Add documentation to time.js explaining UTC format convention

src/db/schema.sql

@@ -19,8 +19,8 @@ CREATE TABLE IF NOT EXISTS mints (
   last_success_at TEXT,
   last_failure_at TEXT,
   consecutive_failures INTEGER DEFAULT 0,
-  created_at TEXT NOT NULL DEFAULT (datetime('now')),
-  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+  created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
+  updated_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
 );
 
 CREATE INDEX IF NOT EXISTS idx_mints_status ON mints(status);
@@ -34,8 +34,8 @@ CREATE TABLE IF NOT EXISTS mint_urls (
   url_normalized TEXT NOT NULL,
   type TEXT NOT NULL DEFAULT 'clearnet' CHECK (type IN ('clearnet', 'tor', 'mirror')),
   active INTEGER NOT NULL DEFAULT 1,
-  discovered_at TEXT NOT NULL DEFAULT (datetime('now')),
-  last_seen_at TEXT NOT NULL DEFAULT (datetime('now'))
+  discovered_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
+  last_seen_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
 );
 
 CREATE INDEX IF NOT EXISTS idx_mint_urls_mint_id ON mint_urls(mint_id);
@@ -51,7 +51,7 @@ CREATE TABLE IF NOT EXISTS probes (
   id INTEGER PRIMARY KEY AUTOINCREMENT,
   mint_id TEXT NOT NULL REFERENCES mints(mint_id) ON DELETE CASCADE,
   url TEXT NOT NULL,
-  probed_at TEXT NOT NULL DEFAULT (datetime('now')),
+  probed_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
   success INTEGER NOT NULL,
   status_code INTEGER,
   rtt_ms INTEGER,
@@ -77,7 +77,7 @@ CREATE TABLE IF NOT EXISTS uptime_rollups (
   total_checks INTEGER NOT NULL DEFAULT 0,
   ok_checks INTEGER NOT NULL DEFAULT 0,
   incident_count INTEGER NOT NULL DEFAULT 0,
-  computed_at TEXT NOT NULL DEFAULT (datetime('now')),
+  computed_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
   UNIQUE(mint_id, window, period_start)
 );
 
@@ -117,14 +117,14 @@ CREATE TABLE IF NOT EXISTS metadata_snapshots (
   server_time TEXT,
   raw_json TEXT,  -- Full raw response
   content_hash TEXT,
-  last_fetched_at TEXT NOT NULL DEFAULT (datetime('now'))
+  last_fetched_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
 );
 
 -- Metadata History: All changes (append-only)
 CREATE TABLE IF NOT EXISTS metadata_history (
   id INTEGER PRIMARY KEY AUTOINCREMENT,
   mint_id TEXT NOT NULL REFERENCES mints(mint_id) ON DELETE CASCADE,
-  fetched_at TEXT NOT NULL DEFAULT (datetime('now')),
+  fetched_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
   change_type TEXT NOT NULL CHECK (change_type IN ('initial', 'update', 'error')),
   diff TEXT,  -- JSON diff of changes
   content_hash TEXT,
@@ -150,7 +150,7 @@ CREATE TABLE IF NOT EXISTS nostr_events (
   tags TEXT,  -- JSON array
   sig TEXT NOT NULL,
   raw_json TEXT NOT NULL,
-  ingested_at TEXT NOT NULL DEFAULT (datetime('now'))
+  ingested_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
 );
 
 CREATE INDEX IF NOT EXISTS idx_nostr_events_event_id ON nostr_events(event_id);
@@ -168,7 +168,7 @@ CREATE TABLE IF NOT EXISTS reviews (
   created_at INTEGER NOT NULL,
   rating INTEGER CHECK (rating >= 1 AND rating <= 5),
   content TEXT,
-  parsed_at TEXT NOT NULL DEFAULT (datetime('now'))
+  parsed_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
 );
 
 CREATE INDEX IF NOT EXISTS idx_reviews_mint_id ON reviews(mint_id);
@@ -185,7 +185,7 @@ CREATE TABLE IF NOT EXISTS trust_scores (
   score_total INTEGER NOT NULL CHECK (score_total >= 0 AND score_total <= 100),
   score_level TEXT NOT NULL CHECK (score_level IN ('unknown', 'low', 'medium', 'high', 'excellent')),
   breakdown TEXT NOT NULL,  -- JSON breakdown of score components
-  computed_at TEXT NOT NULL DEFAULT (datetime('now')),
+  computed_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
   UNIQUE(mint_id, computed_at)
 );
 
@@ -210,7 +210,7 @@ CREATE TABLE IF NOT EXISTS pageviews (
   id INTEGER PRIMARY KEY AUTOINCREMENT,
   mint_id TEXT NOT NULL REFERENCES mints(mint_id) ON DELETE CASCADE,
   session_id TEXT NOT NULL,
-  viewed_at TEXT NOT NULL DEFAULT (datetime('now')),
+  viewed_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
   user_agent TEXT,
   referer TEXT
 );
@@ -228,7 +228,7 @@ CREATE TABLE IF NOT EXISTS pageview_rollups (
   period_end TEXT NOT NULL,
   view_count INTEGER NOT NULL DEFAULT 0,
   unique_sessions INTEGER NOT NULL DEFAULT 0,
-  computed_at TEXT NOT NULL DEFAULT (datetime('now')),
+  computed_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
   UNIQUE(mint_id, window, period_start)
 );
 
@@ -244,13 +244,13 @@ CREATE TABLE IF NOT EXISTS jobs (
   payload TEXT,  -- JSON
   status TEXT NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'running', 'completed', 'failed')),
   priority INTEGER NOT NULL DEFAULT 0,
-  run_at TEXT NOT NULL DEFAULT (datetime('now')),
+  run_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
   started_at TEXT,
   completed_at TEXT,
   retries INTEGER NOT NULL DEFAULT 0,
   max_retries INTEGER NOT NULL DEFAULT 3,
   error_message TEXT,
-  created_at TEXT NOT NULL DEFAULT (datetime('now'))
+  created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
 );
 
 CREATE INDEX IF NOT EXISTS idx_jobs_status_run_at ON jobs(status, run_at);
@@ -264,7 +264,7 @@ CREATE TABLE IF NOT EXISTS system_stats (
   id INTEGER PRIMARY KEY AUTOINCREMENT,
   stat_name TEXT NOT NULL,
   stat_value TEXT NOT NULL,
-  recorded_at TEXT NOT NULL DEFAULT (datetime('now'))
+  recorded_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
 );
 
 CREATE INDEX IF NOT EXISTS idx_system_stats_name ON system_stats(stat_name);