Add monster card table and initial dao

src/main/java/database/monsterbook/MonsterCardDao.java

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+package database.monsterbook;
+
+import database.DaoException;
+import database.PgDatabaseConnection;
+import org.jdbi.v3.core.Handle;
+import org.jdbi.v3.core.JdbiException;
+
+import java.util.List;
+
+public class MonsterCardDao {
+    private final PgDatabaseConnection connection;
+
+    public MonsterCardDao(PgDatabaseConnection connection) {
+        this.connection = connection;
+    }
+
+    public List<MonsterCard> load(int chrId) {
+        try (Handle handle = connection.getHandle()) {
+            return handle.createQuery("""
+                            SELECT *
+                            FROM monster_card
+                            WHERE chr_id = ?;""")
+                    .bind(0, chrId)
+                    .mapTo(MonsterCard.class)
+                    .list();
+        } catch (JdbiException e) {
+            throw new DaoException("Failed to find monster cards for chr id %d".formatted(chrId), e);
+        }
+    }
+}

src/main/java/database/monsterbook/MonsterCardRowMapper.java

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+package database.monsterbook;
+
+import org.jdbi.v3.core.mapper.RowMapper;
+import org.jdbi.v3.core.statement.StatementContext;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public class MonsterCardRowMapper implements RowMapper<MonsterCard> {
+
+    @Override
+    public MonsterCard map(ResultSet rs, StatementContext ctx) throws SQLException {
+        int cardId = rs.getInt("card_id");
+        byte level = rs.getByte("level");
+        return new MonsterCard(cardId, level);
+    }
+}

src/main/resources/db/migration/postgresql/V0.7__monster_card.sql

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+CREATE TABLE monster_card
+(
+    chr_id  integer  NOT NULL,
+    card_id integer  NOT NULL,
+    level   smallint NOT NULL,
+    PRIMARY KEY(chr_id, card_id)
+    /* TODO once chr is moved to postgres:
+      CONSTRAINT fk_monster_card_chr FOREIGN KEY (chr_id) REFERENCES character(id);
+    */
+);
+GRANT SELECT, INSERT, UPDATE ON TABLE monster_card TO ${server-username};