-- Additive utility-local schema. Migration content is fingerprinted at application time.
CREATE TABLE IF NOT EXISTS schema_migrations (
  version INTEGER PRIMARY KEY,
  filename TEXT NOT NULL UNIQUE,
  checksum TEXT NOT NULL,
  applied_at TEXT NOT NULL
);
CREATE TABLE blobs (
  sha256 TEXT PRIMARY KEY CHECK(length(sha256) = 64),
  byte_size INTEGER NOT NULL CHECK(byte_size > 0),
  media_type TEXT NOT NULL CHECK(length(media_type) <= 100),
  created_at TEXT NOT NULL
);
CREATE TABLE captures (
  capture_id TEXT PRIMARY KEY,
  blob_sha256 TEXT NOT NULL REFERENCES blobs(sha256) ON DELETE RESTRICT,
  state TEXT NOT NULL,
  received_at TEXT NOT NULL,
  receipt_token TEXT NOT NULL UNIQUE,
  failure_reason TEXT,
  revision INTEGER NOT NULL DEFAULT 0
);
CREATE TABLE jobs (
  job_id TEXT PRIMARY KEY,
  capture_id TEXT REFERENCES captures(capture_id) ON DELETE RESTRICT,
  kind TEXT NOT NULL CHECK(length(kind) <= 100),
  state TEXT NOT NULL,
  attempt INTEGER NOT NULL DEFAULT 0 CHECK(attempt >= 0 AND attempt <= 20),
  max_attempts INTEGER NOT NULL CHECK(max_attempts BETWEEN 1 AND 20),
  lease_owner TEXT, lease_expires_at TEXT, last_error_id TEXT,
  revision INTEGER NOT NULL DEFAULT 0
);
CREATE INDEX jobs_available ON jobs(state, lease_expires_at);
CREATE TABLE ocr_runs (
  run_id TEXT PRIMARY KEY, capture_id TEXT NOT NULL REFERENCES captures(capture_id),
  engine_id TEXT NOT NULL, engine_version TEXT NOT NULL, created_at TEXT NOT NULL,
  state TEXT NOT NULL, payload_json TEXT NOT NULL CHECK(length(payload_json) <= 1000000)
);
CREATE TABLE regions (
  region_id TEXT PRIMARY KEY, run_id TEXT NOT NULL REFERENCES ocr_runs(run_id),
  region_json TEXT NOT NULL CHECK(length(region_json) <= 10000), created_at TEXT NOT NULL
);
CREATE TABLE classifications (
  classification_id TEXT PRIMARY KEY, run_id TEXT NOT NULL REFERENCES ocr_runs(run_id),
  classification_json TEXT NOT NULL CHECK(length(classification_json) <= 10000), created_at TEXT NOT NULL
);
CREATE TABLE extraction_candidates (
  candidate_id TEXT PRIMARY KEY, run_id TEXT NOT NULL REFERENCES ocr_runs(run_id),
  candidate_json TEXT NOT NULL CHECK(length(candidate_json) <= 1000000), created_at TEXT NOT NULL
);
CREATE TABLE routing_decisions (
  decision_id TEXT PRIMARY KEY, candidate_id TEXT REFERENCES extraction_candidates(candidate_id),
  decision_json TEXT NOT NULL CHECK(length(decision_json) <= 10000), created_at TEXT NOT NULL
);
CREATE TABLE review_events (
  event_id TEXT PRIMARY KEY, candidate_id TEXT REFERENCES extraction_candidates(candidate_id),
  event_json TEXT NOT NULL CHECK(length(event_json) <= 10000), created_at TEXT NOT NULL
);
CREATE TABLE lineage (
  lineage_id TEXT PRIMARY KEY, child_id TEXT NOT NULL, parent_id TEXT NOT NULL,
  relation TEXT NOT NULL CHECK(length(relation) <= 100), created_at TEXT NOT NULL
);
CREATE TABLE exports (
  export_id TEXT PRIMARY KEY, state TEXT NOT NULL, manifest_json TEXT NOT NULL CHECK(length(manifest_json) <= 1000000), created_at TEXT NOT NULL, revision INTEGER NOT NULL DEFAULT 0
);
CREATE TABLE runtime_failures (
  failure_id TEXT PRIMARY KEY, subject_type TEXT NOT NULL, subject_id TEXT NOT NULL,
  code TEXT NOT NULL, message TEXT NOT NULL CHECK(length(message) <= 512), created_at TEXT NOT NULL
);