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CREATE TABLE IF NOT EXISTS image(
sha1 TEXT NOT NULL, -- SHA-1 hash of file in lowercase hexadecimal
thumbw INTEGER, -- cached thumbnail width, if known
thumbh INTEGER, -- cached thumbnail height, if known
dhash INTEGER, -- uint64 perceptual hash as a signed integer
PRIMARY KEY (sha1)
) STRICT;
CREATE INDEX IF NOT EXISTS image__dhash ON image(dhash);
--
CREATE TABLE IF NOT EXISTS directory(
id INTEGER NOT NULL, -- unique ID
name TEXT NOT NULL, -- basename
parent INTEGER REFERENCES directory(id), -- root if NULL
PRIMARY KEY (id)
) STRICT;
CREATE UNIQUE INDEX IF NOT EXISTS directory__parent_name
ON directory(IFNULL(parent, 0), name);
-- FIXME: I want a nullable parent, but that can't be a primary key.
-- - Perhaps have an INTEGER for the PK of entry, and use a UNIQUE INDEX.
-- - Alternatively, create a directory record for the root.
CREATE TABLE IF NOT EXISTS entry(
parent INTEGER NOT NULL REFERENCES directory(id),
name TEXT NOT NULL, -- last FS path component
mtime INTEGER NOT NULL, -- Unix time of last modification in seconds
sha1 TEXT NOT NULL REFERENCES image(sha1),
PRIMARY KEY (parent, name)
) STRICT;
CREATE INDEX IF NOT EXISTS entry__sha1 ON entry(sha1);
/*
Automatic garbage collection, not sure if it actually makes any sense:
CREATE TRIGGER IF NOT EXISTS entry__parent__gc
AFTER DELETE ON entry FOR EACH ROW
BEGIN
DELETE FROM directory WHERE id = OLD.parent
AND id NOT IN (SELECT DISTINCT parent FROM entry)
AND id NOT IN (SELECT DISTINCT parent FROM directory);
END;
CREATE TRIGGER IF NOT EXISTS directory__parent__gc
AFTER DELETE ON directory FOR EACH ROW
BEGIN
DELETE FROM directory WHERE id = OLD.parent
AND id NOT IN (SELECT DISTINCT parent FROM entry)
AND id NOT IN (SELECT DISTINCT parent FROM directory);
END;
*/
--
CREATE TABLE IF NOT EXISTS tag_space(
id INTEGER NOT NULL,
name TEXT NOT NULL,
description TEXT,
PRIMARY KEY (id)
) STRICT;
CREATE UNIQUE INDEX IF NOT EXISTS tag_space__name ON tag_space(name);
-- To avoid having to deal with NULLs, always create this special tag space.
INSERT OR IGNORE INTO tag_space(id, name, description)
VALUES(0, '', 'User-defined tags');
CREATE TABLE IF NOT EXISTS tag(
id INTEGER NOT NULL,
space INTEGER NOT NULL REFERENCES tag_space(id),
name TEXT NOT NULL,
PRIMARY KEY (id)
) STRICT;
CREATE UNIQUE INDEX IF NOT EXISTS tag__space_name ON tag(space, name);
CREATE TABLE IF NOT EXISTS tag_assignment(
sha1 TEXT NOT NULL REFERENCES image(sha1),
tag INTEGER NOT NULL REFERENCES tag(id),
weight REAL NOT NULL, -- 0..1 normalized weight assigned to tag
PRIMARY KEY (sha1, tag)
) STRICT;
CREATE INDEX IF NOT EXISTS tag_assignment__tag ON tag_assignment(tag);
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