PRAGMA foreign_keys=ON;
PRAGMA journal_mode=WAL;
CREATE TABLE IF NOT EXISTS sources (
 id INTEGER PRIMARY KEY, name TEXT NOT NULL UNIQUE, homepage TEXT NOT NULL
);
CREATE TABLE IF NOT EXISTS papers (
 id INTEGER PRIMARY KEY AUTOINCREMENT, title TEXT NOT NULL, abstract TEXT,
 title_key TEXT NOT NULL, authors_json TEXT NOT NULL DEFAULT '[]',
 first_published TEXT, created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);
CREATE INDEX IF NOT EXISTS papers_title_key ON papers(title_key);
CREATE TABLE IF NOT EXISTS identifiers (
 scheme TEXT NOT NULL, value TEXT NOT NULL, paper_id INTEGER NOT NULL REFERENCES papers(id),
 PRIMARY KEY(scheme,value)
);
CREATE INDEX IF NOT EXISTS identifiers_paper ON identifiers(paper_id);
CREATE TABLE IF NOT EXISTS source_records (
 id INTEGER PRIMARY KEY, source_id INTEGER NOT NULL REFERENCES sources(id),
 external_id TEXT NOT NULL, paper_id INTEGER NOT NULL REFERENCES papers(id),
 url TEXT NOT NULL, title TEXT NOT NULL, abstract TEXT, authors_json TEXT NOT NULL,
 metadata_json TEXT NOT NULL, retrieved_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
 UNIQUE(source_id,external_id)
);
CREATE INDEX IF NOT EXISTS source_records_paper ON source_records(paper_id);
CREATE TABLE IF NOT EXISTS venues (
 id INTEGER PRIMARY KEY, acronym TEXT NOT NULL UNIQUE, name TEXT NOT NULL,
 field TEXT NOT NULL, venue_type TEXT NOT NULL CHECK(venue_type IN ('conference','journal','review_platform'))
);
CREATE TABLE IF NOT EXISTS editions (
 id INTEGER PRIMARY KEY, venue_id INTEGER NOT NULL REFERENCES venues(id),
 year INTEGER NOT NULL, track TEXT NOT NULL DEFAULT 'main',
 UNIQUE(venue_id,year,track)
);
CREATE TABLE IF NOT EXISTS edition_sources (
 edition_id INTEGER NOT NULL REFERENCES editions(id), source_id INTEGER NOT NULL REFERENCES sources(id),
 list_url TEXT NOT NULL, status TEXT NOT NULL DEFAULT 'pending'
 CHECK(status IN ('pending','running','complete','partial','blocked','unavailable','not_yet_published')),
 expected_count INTEGER, imported_count INTEGER NOT NULL DEFAULT 0,
 cursor TEXT, last_success_at TEXT, last_error TEXT,
 PRIMARY KEY(edition_id,source_id,list_url)
);
CREATE TABLE IF NOT EXISTS submissions (
 id INTEGER PRIMARY KEY, paper_id INTEGER NOT NULL REFERENCES papers(id),
 edition_id INTEGER NOT NULL REFERENCES editions(id),
 source_record_id INTEGER NOT NULL REFERENCES source_records(id),
 source_submission_id TEXT NOT NULL, submitted_at TEXT,
 UNIQUE(source_record_id,edition_id,source_submission_id)
);
CREATE INDEX IF NOT EXISTS submissions_paper ON submissions(paper_id);
CREATE TABLE IF NOT EXISTS decisions (
 id INTEGER PRIMARY KEY, submission_id INTEGER NOT NULL REFERENCES submissions(id),
 status TEXT NOT NULL CHECK(status IN ('accepted','rejected','desk_rejected','withdrawn','under_review','unknown')),
 raw_value TEXT NOT NULL, evidence_url TEXT NOT NULL, observed_at TEXT NOT NULL,
 decision_date TEXT, UNIQUE(submission_id,status,raw_value,evidence_url,observed_at)
);
CREATE TABLE IF NOT EXISTS tags (
 id INTEGER PRIMARY KEY, namespace TEXT NOT NULL, value TEXT NOT NULL,
 description TEXT, UNIQUE(namespace,value)
);
CREATE TABLE IF NOT EXISTS paper_tags (
 paper_id INTEGER NOT NULL REFERENCES papers(id), tag_id INTEGER NOT NULL REFERENCES tags(id),
 source_record_id INTEGER REFERENCES source_records(id),
 evidence_key TEXT NOT NULL, PRIMARY KEY(paper_id,tag_id,evidence_key)
);
CREATE TABLE IF NOT EXISTS match_candidates (
 left_paper_id INTEGER NOT NULL REFERENCES papers(id), right_paper_id INTEGER NOT NULL REFERENCES papers(id),
 method TEXT NOT NULL, score REAL, evidence_json TEXT NOT NULL,
 status TEXT NOT NULL DEFAULT 'pending' CHECK(status IN ('pending','merged','distinct')),
 PRIMARY KEY(left_paper_id,right_paper_id,method)
);
CREATE TABLE IF NOT EXISTS paper_merges (
 id INTEGER PRIMARY KEY, former_paper_id INTEGER NOT NULL,
 surviving_paper_id INTEGER NOT NULL REFERENCES papers(id),
 reason TEXT NOT NULL, merged_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);
CREATE TABLE IF NOT EXISTS ingest_runs (
 id INTEGER PRIMARY KEY, source_id INTEGER NOT NULL REFERENCES sources(id),
 started_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP, finished_at TEXT,
 status TEXT NOT NULL DEFAULT 'running', records_seen INTEGER NOT NULL DEFAULT 0,
 records_written INTEGER NOT NULL DEFAULT 0, error TEXT, checkpoint_json TEXT
);
CREATE VIRTUAL TABLE IF NOT EXISTS papers_fts USING fts5(title,abstract,content='papers',content_rowid='id');
CREATE TRIGGER IF NOT EXISTS papers_insert AFTER INSERT ON papers BEGIN
 INSERT INTO papers_fts(rowid,title,abstract) VALUES(new.id,new.title,new.abstract);
END;
CREATE TRIGGER IF NOT EXISTS papers_delete AFTER DELETE ON papers BEGIN
 INSERT INTO papers_fts(papers_fts,rowid,title,abstract) VALUES('delete',old.id,old.title,old.abstract);
END;
CREATE TRIGGER IF NOT EXISTS papers_update AFTER UPDATE OF title,abstract ON papers BEGIN
 INSERT INTO papers_fts(papers_fts,rowid,title,abstract) VALUES('delete',old.id,old.title,old.abstract);
 INSERT INTO papers_fts(rowid,title,abstract) VALUES(new.id,new.title,new.abstract);
END;