Migrate dataset to SQLite database & Add SQL and TSV metadata exports

[YourMJK]

Migrate dataset to SQLite database (#14)

Based on the new relational model (see #23), migrated the JSON dataset to a new SQLite database using the schema below.

Changes:

• Refined relational model
• Updated migrate subcommand to create SQLite database using GRDB.swift

Add SQL and TSV metadata exports

Added exported database as SQL dump (metadata/db.sql) and TSV files (metadata/tsv/).

New subcommands:

• export tsv: Export database as TSV files.
• export sql: Dump database to SQL format.
• load: Load database from SQL dump.

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CREATE TABLE "hörspiel"(
    "hörspielID" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
    "titel" TEXT NOT NULL,
    "kurzbeschreibung" TEXT,
    "beschreibung" TEXT,
    "metabeschreibung" TEXT,
    "veröffentlichungsdatum" DATE,
    "unvollständig" BOOLEAN NOT NULL,
    "cover" BOOLEAN NOT NULL,
    "urlCoverApple" TEXT,
    "urlCoverKosmos" TEXT
);
CREATE TABLE "hörspielTeil"(
    "teil" INTEGER PRIMARY KEY NOT NULL REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE,
    "hörspiel" INTEGER NOT NULL REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE,
    "position" INTEGER NOT NULL CHECK("position" > 0),
    "buchstabe" TEXT CHECK(LENGTH("buchstabe") = 1),
    UNIQUE("hörspiel", "position"),
    UNIQUE("hörspiel", "buchstabe")
);

CREATE TABLE "serie"(
    "nummer" INTEGER PRIMARY KEY NOT NULL,
    "hörspielID" INTEGER NOT NULL UNIQUE REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE
);
CREATE TABLE "spezial"(
    "hörspielID" INTEGER PRIMARY KEY NOT NULL REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE
);
CREATE TABLE "kurzgeschichten"(
    "hörspielID" INTEGER PRIMARY KEY NOT NULL REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE
);
CREATE TABLE "dieDr3i"(
    "nummer" INTEGER PRIMARY KEY NOT NULL,
    "hörspielID" INTEGER NOT NULL UNIQUE REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE
);

CREATE TABLE "medium"(
    "mediumID" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
    "hörspielID" INTEGER NOT NULL REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE,
    "position" INTEGER NOT NULL CHECK("position" > 0),
    "xldLog" BOOLEAN NOT NULL,
    UNIQUE("hörspielID", "position")
);
CREATE TABLE "track"(
    "trackID" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
    "mediumID" INTEGER NOT NULL REFERENCES "medium"("mediumID") ON DELETE CASCADE ON UPDATE CASCADE,
    "position" INTEGER NOT NULL CHECK("position" > 0),
    "titel" TEXT NOT NULL,
    "dauer" INTEGER NOT NULL CHECK("dauer" > 0),
    UNIQUE("mediumID", "position")
);
CREATE TABLE "kapitel"(
    "trackID" INTEGER PRIMARY KEY NOT NULL REFERENCES "track"("trackID") ON DELETE CASCADE ON UPDATE CASCADE,
    "hörspielID" INTEGER NOT NULL REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE,
    "position" INTEGER NOT NULL CHECK("position" > 0),
    "abweichenderTitel" TEXT,
    UNIQUE("hörspielID", "position")
);

CREATE TABLE "person"(
    "personID" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
    "name" TEXT NOT NULL UNIQUE
);
CREATE TABLE "pseudonym"(
    "pseudonymID" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
    "name" TEXT NOT NULL UNIQUE
);
CREATE TABLE "rolle"(
    "rolleID" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
    "name" TEXT NOT NULL UNIQUE
);
CREATE TABLE "sprechrolle"(
    "sprechrolleID" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
    "hörspielID" INTEGER NOT NULL REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE,
    "rolleID" INTEGER NOT NULL REFERENCES "rolle"("rolleID") ON DELETE CASCADE ON UPDATE CASCADE,
    "position" INTEGER NOT NULL CHECK("position" > 0),
    UNIQUE("hörspielID", "rolleID"),
    UNIQUE("hörspielID", "position")
);
CREATE TABLE "spricht"(
    "sprechrolleID" INTEGER NOT NULL REFERENCES "sprechrolle"("sprechrolleID") ON DELETE CASCADE ON UPDATE CASCADE,
    "personID" INTEGER NOT NULL REFERENCES "person"("personID") ON DELETE CASCADE ON UPDATE CASCADE,
    "pseudonymID" INTEGER REFERENCES "pseudonym"("pseudonymID") ON DELETE SET NULL ON UPDATE CASCADE,
    PRIMARY KEY("sprechrolleID", "personID")
);

CREATE TABLE "hörspielBuchautor"(
    "hörspielID" INTEGER NOT NULL REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE,
    "personID" INTEGER NOT NULL REFERENCES "person"("personID") ON DELETE CASCADE ON UPDATE CASCADE,
    PRIMARY KEY("hörspielID", "personID")
);
CREATE TABLE "hörspielSkriptautor"(
    "hörspielID" INTEGER NOT NULL REFERENCES "hörspiel"("hörspielID") ON DELETE CASCADE ON UPDATE CASCADE,
    "personID" INTEGER NOT NULL REFERENCES "person"("personID") ON DELETE CASCADE ON UPDATE CASCADE,
    PRIMARY KEY("hörspielID", "personID")
);