feat: implement RSS subscriptions, downloader routing and local media checks

migrations/0003_media_destinations.sql

@@ -0,0 +1,37 @@
+CREATE TABLE media_destinations (
+    id TEXT PRIMARY KEY,
+    name TEXT NOT NULL,
+    kind TEXT NOT NULL CHECK (kind = 'local'),
+    root_path TEXT NOT NULL
+);
+CREATE TABLE destination_selection (
+    singleton INTEGER PRIMARY KEY CHECK (singleton = 1),
+    destination_id TEXT REFERENCES media_destinations(id)
+);
+INSERT INTO destination_selection(singleton) VALUES (1);
+CREATE TABLE destination_mappings (
+    id TEXT PRIMARY KEY,
+    destination_id TEXT NOT NULL REFERENCES media_destinations(id),
+    downloader_id TEXT NOT NULL REFERENCES downloader_instances(id),
+    version INTEGER NOT NULL,
+    download_root TEXT NOT NULL,
+    UNIQUE(destination_id, downloader_id, version)
+);
+ALTER TABLE download_jobs ADD COLUMN destination_id TEXT REFERENCES media_destinations(id);
+ALTER TABLE download_jobs ADD COLUMN mapping_id TEXT REFERENCES destination_mappings(id);
+ALTER TABLE download_jobs ADD COLUMN download_save_path TEXT;
+ALTER TABLE download_jobs ADD COLUMN file_status TEXT NOT NULL DEFAULT 'unchecked'
+    CHECK (file_status IN ('unchecked', 'present', 'absent', 'unavailable'));
+ALTER TABLE download_jobs ADD COLUMN file_checked_at INTEGER;
+ALTER TABLE download_jobs ADD COLUMN file_last_success_at INTEGER;
+ALTER TABLE download_jobs ADD COLUMN file_error TEXT;
+CREATE TABLE media_files (
+    job_id TEXT NOT NULL REFERENCES download_jobs(id),
+    relative_path TEXT NOT NULL,
+    expected_size INTEGER NOT NULL,
+    observed_size INTEGER,
+    status TEXT NOT NULL DEFAULT 'unchecked'
+        CHECK (status IN ('unchecked', 'present', 'absent', 'unavailable')),
+    error TEXT,
+    PRIMARY KEY(job_id, relative_path)
+);