Speed up timeline load with portrait thumbs, bootstrap API, and caching.

Add catalog bootstrap endpoint, portrait thumbnail pipeline, lazy queued timeline images, gzip compression, and 3D texture throttling with code-split VirtualGallery.

db/migrate-perf-indexes.sql

@@ -0,0 +1,4 @@
+-- Query performance for timeline filters and influence lookups
+CREATE INDEX IF NOT EXISTS idx_artists_birth_year ON artists(birth_year);
+CREATE INDEX IF NOT EXISTS idx_artists_death_year ON artists(death_year);
+CREATE INDEX IF NOT EXISTS idx_influence_sources_source_painting ON painting_influence_sources(source_painting_id);

db/migrate-portrait-thumbs.sql

@@ -0,0 +1,2 @@
+-- Timeline portrait thumbnails (~256px) under portraits/thumbs/
+ALTER TABLE artists ADD COLUMN IF NOT EXISTS portrait_thumb_path TEXT;

db/schema.sql

@@ -32,6 +32,7 @@ CREATE TABLE IF NOT EXISTS artists (
     death_year INTEGER,
     movement_id INTEGER REFERENCES art_movements(id),
     portrait_path VARCHAR(500),
+    portrait_thumb_path VARCHAR(500),
     bio_short TEXT,
     bio_full TEXT,
     wikipedia_title VARCHAR(300),
@@ -121,6 +122,8 @@ CREATE TABLE IF NOT EXISTS painting_annotations (
 );
 
 CREATE INDEX IF NOT EXISTS idx_artists_movement ON artists(movement_id);
+CREATE INDEX IF NOT EXISTS idx_artists_birth_year ON artists(birth_year);
+CREATE INDEX IF NOT EXISTS idx_artists_death_year ON artists(death_year);
 CREATE INDEX IF NOT EXISTS idx_artists_century ON artists(century);
 CREATE INDEX IF NOT EXISTS artists_checkup_checked_idx ON artists (checkup_checked);
 CREATE INDEX IF NOT EXISTS artists_checkup_fixed_idx ON artists (checkup_fixed);
@@ -149,6 +152,9 @@ CREATE UNIQUE INDEX IF NOT EXISTS painting_influence_sources_unique
 CREATE INDEX IF NOT EXISTS painting_influence_sources_painting_idx
     ON painting_influence_sources (painting_id);
 
+CREATE INDEX IF NOT EXISTS idx_influence_sources_source_painting
+    ON painting_influence_sources (source_painting_id);
+
 CREATE INDEX IF NOT EXISTS painting_influence_sources_artist_idx
     ON painting_influence_sources (source_artist_id);