Hi Jim
I've seen pa_photos, so for each photo_id I can get:
Table "public.pa_photos"
     Column     |            Type             | Modifiers
----------------+-----------------------------+-----------
 pa_photo_id    | integer                     | not null
 caption        | character varying(500)      |
 story          | text                        |
 user_filename  | character varying(250)      |
 camera_model   | character varying(250)      |
 date_taken     | timestamp without time zone |
 flash          | boolean                     |
 focal_length   | numeric                     |
 exposure_time  | numeric                     |
 aperture       | character varying(32)       |
 focus_distance | numeric                     |
 metering       | character varying(100)      |
 sha256         | character varying(64)       |
 photographer   | character varying(200)      |
so, at least user_filename. But I think I'd had to bind filename with content repository ID.
About album, I saw pa_albums:
Table "public.pa_albums"
    Column    |            Type             | Modifiers
--------------+-----------------------------+-----------
 pa_album_id  | integer                     | not null
 story        | text                        |
 photographer | character varying(200)      |
 taken_start  | timestamp without time zone |
 taken_end    | timestamp without time zone |
 iconic       | integer
So I could get story of the album, not the name.
Definitively, I had to study how to manage content repository.
Thanks for your points!
Cesáreo