pgz-sport/_audit/audit_DB_INTEGRITY.md

SA-3 DB Integrity Probe

Generated: 2026-05-05T06:24:49Z DB: rinet_v3 @ 10.10.0.2:6432 Schema: pgz_sport

1. Row counts

SELECT relname, n_live_tup FROM pg_stat_user_tables
WHERE schemaname='pgz_sport' ORDER BY n_live_tup DESC;

Top live (production) tables and key backups. Note: the schema contains a large number of *_backup_* / *_premerge_* / *_dedup_* / *_pre_* snapshot tables (clean-up debris). Only the canonical production tables are highlighted below; the rest are listed beneath.

Table	Rows
clanovi	3248
klubovi	2244
sportski_objekti	106
savezi	246
dokumenti	7073
dokument_chunks	2850
utakmice_log	9267
rno_bilanca	6500
rno_prras	6500
clan_godisnjak	2398
clan_nagrada	2028
natjecanja_tablice	959
clan_sezona	689
hns_klubovi_natjecanje	635
klub_sezona	631
sys_audit	627
enrichment_log	616
dokument_primjena	439
natjecanja	428
clanovi_deleted_empty	372
clanstvo_kategorije	313
natjecanje_tablica	304
vijesti	286
savez_stats_oficijalno	284
najbolji_sportasi	243
user_sessions	235
sys_role_permissions	220
audit_events	193
potpore_nositelji	182
savez_statistika_clanstvo	177
statistika_saveza	169
osobe_funkcije	159
sport_facts	135
audit_feed	131
dobne_kategorije	127
manifestacije	113
sufinanciranje_sport	110
alertovi	89
ai_grad_distances	78
hns_natjecanja	74
notifications	66
sys_permissions	54
zsp_dokumenti	54
uloga_katalog	49
clanarine	48
mediji	42
treneri	38
account_codes	31
audit_log	29
suci	27
rno_sportske_udruge	21
users	18
lijecnicki_pregledi	16
form_templates	15
invoices	14
specijalisti_med	13
akademski_sport	11
proracun	11
hoo_pravilnici	8
alert_rules	8
roles	7
scraper_runs	6
invoice_uploads	5
payments	5
user_action_tokens	5
tenants	5
polygon_seals	5
expense_reports	4
javne_potrebe	4
user_klub_links	4
form_submissions	3
email_templates	3
gdpr_erasure_requests	3
sportas_specifika	2
gdpr_consent	2
user_roles	1
putni_nalog_racuni	1
user_2fa	1
invoice_lines	1
llm_extracted_facts	0
scrape_jobs	0
clan_utakmica	0
natjecanja_utakmice	0
user_permissions	0
sponzori	0

Backup/snapshot tables (candidates for archival drop)

These are stale workflow artefacts taking up significant rows; they should not be queried by app code:

Table	Rows
clanovi_pre_godisnjak_backup	25944
klubovi_garbage_backup_1777750740	10072
klubovi_dedup_v2_1777750793	9920
klubovi_dedup_v3_1777750848	9672
clanovi_backup_20260430	9572
klubovi_premerge_20260503c	8976
klubovi_premerge_20260503b	8976
klubovi_pre_cleanup_20260430	8120
klubovi_pre_dedup_20260430	5960
klubovi_premerge_20260503	2572
klubovi_backup_20260505	2244
clanovi_purge_backup_20260429	1576
clanovi_dedup_20260502_v2	1384
klub_sezona_backup_20260502	1092
clanovi_dedup_backup_20260429	532
klubovi_sport_rename_backup_1777756941	396
klubovi_dedup_20260502	140
sponzori_mock_backup_1777756941	88
klubovi_finaldd_backup_1777752742	72
klubovi_garbage_backup_20260502	36
rno_organizacije	1482 (may be production)
sys_users_deprecated_20260429	9
klubovi_dedup_haok_backup_20260505	3
sys_user_klub_links_deprecated_20260429	2
klubovi_garbage_backup_1777752698	0
sys_sessions_deprecated_20260429	0
sys_user_permissions_deprecated_20260429	0

Total backup rows held: ~97,000+ (about 30x the canonical row count).

2. NULL/empty critical columns

SELECT 'clanovi.ime',           COUNT(*) FILTER (WHERE ime IS NULL),    COUNT(*) FILTER (WHERE ime = '')      FROM pgz_sport.clanovi
UNION ALL SELECT 'clanovi.prezime',       COUNT(*) FILTER (WHERE prezime IS NULL),COUNT(*) FILTER (WHERE prezime = '')  FROM pgz_sport.clanovi
UNION ALL SELECT 'klubovi.naziv',         COUNT(*) FILTER (WHERE naziv IS NULL),  COUNT(*) FILTER (WHERE naziv = '')    FROM pgz_sport.klubovi
UNION ALL SELECT 'savezi.naziv',          COUNT(*) FILTER (WHERE naziv IS NULL),  COUNT(*) FILTER (WHERE naziv = '')    FROM pgz_sport.savezi
UNION ALL SELECT 'sportski_objekti.naziv',COUNT(*) FILTER (WHERE naziv IS NULL),  COUNT(*) FILTER (WHERE naziv = '')    FROM pgz_sport.sportski_objekti;

Column	NULLs	Empties
clanovi.ime	0	0
clanovi.prezime	0	0
klubovi.naziv	0	0
savezi.naziv	0	0
sportski_objekti.naziv	0	0

Verdict: clean. The recent dedup/cleanup passes have eliminated all NULL/empty primary identifiers.

3. Orphan FKs

SELECT 'clanovi.klub_id->klubovi', COUNT(*) FROM pgz_sport.clanovi c
  WHERE c.klub_id IS NOT NULL AND NOT EXISTS (SELECT 1 FROM pgz_sport.klubovi k WHERE k.id=c.klub_id)
UNION ALL
SELECT 'klubovi.savez_id->savezi', COUNT(*) FROM pgz_sport.klubovi k
  WHERE k.savez_id IS NOT NULL AND NOT EXISTS (SELECT 1 FROM pgz_sport.savezi s WHERE s.id=k.savez_id)
UNION ALL
SELECT 'sys_audit.user_id->users', COUNT(*) FROM pgz_sport.sys_audit a
  WHERE a.user_id IS NOT NULL AND NOT EXISTS (SELECT 1 FROM pgz_sport.users u WHERE u.id=a.user_id);

Constraint	Orphan rows
clanovi.klub_id -> klubovi.id	0
klubovi.savez_id -> savezi.id	0
sys_audit.user_id -> users.id	0

Verdict: clean. All FK chains are intact.

4. Duplicate OIBs

SELECT oib, count(*), string_agg(naziv, ' | ')
FROM pgz_sport.klubovi
WHERE oib IS NOT NULL AND oib ~ '^[0-9]{11}$'
GROUP BY oib HAVING count(*)>1;

48 distinct OIBs are shared by 2-4 klubovi rows each (~100 duplicate rows total). This is the single largest data-quality issue.

OIB	Count	Names
86603390999	3	Juniorska ekipa Sv.Rok-Klana | Boćarski Klub Sv. Rok Klana | Sveti Rok-Klana
80500347365	3	HNK Orijent | Hrvatski Nogometni Klub Orijent | HNK Orijent 1919 (Sušak)
44908060737	3	Boćarski Klub Krimeja | Krimeja | BK Krimeja
19490107091	3	BOĆARSKI KLUB "LOVRAN" | Kadetska ekipa BK Lovran | Boćarski klub Lovran
29964028897	4	Boćarski klub Kastav | Kadetska ekipa BK Kastav 2 | Kadetska ekipa BK Kastav | Boćarski klub Kastav
17563258345	3	Plivački Klub Primorje Rijeka | KLUB DALJINSKOG PLIVANJA "PRIMORJE" | KLUB UMJETNIČKOG PLIVANJA „PRIMORJE AQUA MARIS" RIJEKA
15986803554	2	Košarkaški Klub Kvarner | Košarkaški klub KVARNER 2010
35549440954	2	Muški Odbojkaški Klub "Gornja Vežica" | Muški Odbojkaški Klub Gornja Vežica
37941242606	2	Muški Boćarski Klub Hreljin | Boćarski klub Hreljin
56273001018	2	Nogometni klub Turbina Bakar | Nogometni Klub Turbina Tribalj
67434497493	2	Odbojkaški Klub Rab | Odbojkaški Klub "Rab"
47139832980	2	Hrvatski Akademski Odbojkaški Klub "Rijeka" | HRVATSKI AKADEMSKI ODBOJKAŠKI KLUB "RIJEKA"
19514046928	2	Lovačko društvo "JELEN" Čavle | LOVAČKO DRUŠTVO "JELEN" ČAVLE
83495265520	2	Odbojkaški Klub "Kastav 1998" | Odbojkaški Klub Kastav 1998
14384540738	2	Boćarski klub Kostrena | Boćarski Klub Kostrena
17639054753	2	Streljački Klub Gluhih Galeb | Streljački klub gluhih "Galeb"
40538276343	2	Odbojkaški Klub "Odbojkaška Akademija Petica" | Odbojkaški klub Odbojkaška Akademija Petica
76273502221	2	Boćarski Klub Srdoči 1983 | Srdoči 1983
17934350916	2	NOGOMETNI KLUB "KLANA" | NK Klana
81511316706	2	Odbojkaški Klub Kostrena Kostrena | Odbojkaški Klub "Kostrena" Kostrena
27991069782	2	Boćarski Klub Čavle Šb Čavle | Juniorska ekipa Čavle ŠB
44509762938	2	Kadetska ekipa BK Sveti Jakov | Boćarski Klub Sveti Jakov Jadranovo
38093446162	2	Lovranska Draga | Boćarski Klub Lovranska Draga
56132503774	2	Nogometni Klub Draga-Mošćenička Draga | NK Draga
40936837495	2	Lovačko društvo "KAMENJARKA" Kukuljanovo | LOVAČKO DRUŠTVO "KAMENJARKA" KUKULJANOVO-ŠKRLJEVO
02999668483	2	ŠK Goranka | KK Goranka
35883230704	2	Lovačko društvo "MEDVIĐAK" Drivenik Tribalj | LOVAČKO DRUŠTVO "MEDVIĐAK" DRIVENIK
27420052480	2	Krenovac | Boćarski Klub Krenovac
17195966673	2	Ženski Odbojkaški Klub "Crikvenica" | Ženski Odbojkaški Klub Crikvenica
51108883738	2	NK Risnjak | Nogometni Klub Risnjak Lokve
13794801696	2	Ženski nogometni klub Rijeka Jack Pot | Ženski nogometni klub Rijeka
33154520914	2	Malonogometni klub gluhih "Galeb" | Malonogometni Klub Gluhih Galeb
52818156657	2	Parastreljački Klub Paraolimpijac | Parastreljački klub "Paraolimpijac"
42449645267	2	Paraatletski Klub Rijeka | Paraatletski klub "Srce" Rijeka
75947125821	2	Boćarski klub Opatija | Boćarski Klub Opatija
43219260850	2	Ženski Akademski Odbojkaški Klub Škurinje Rijeka | Ženski Akademski Odbojkaški Klub Škurinje Rijeka
85575561127	2	SPORTSKO-REKREACIJSKO DRUŠTVO VIŠEVICA | rekreacijsko društvo VIŠEVICA
19353575292	2	Odbojkaški Klub "Sveti Matej 06" - Viškovo | Odbojkaški Klub Sveti Matej 06 - Viškovo
86232456523	2	Boćarski klub Krk | Boćarski klub Krk
74630525187	2	Nogometni klub Omladinac | NK Omladinac Vrata
83261523211	2	Odbojkaški Klub Opatija Volley | ODBOJKAŠKI KLUB OPATIJA VOLLEY
98146784649	2	Boćarski Klub Draga Mošćenička Draga | Draga – Mošćenička Draga
39250096592	2	Boćarski klub Brod Moravice | Boćarski Klub Brod Moravice
76221716576	2	Kuglački Klub Gluhih Galeb | Kuglački klub gluhih "Galeb"
10132566066	2	Vaterpolo klub PRIMORJE-ERSTE BANKA-ženska ekipa | Vaterpolo klub PRIMORJE-ERSTE BANKA-muška ekipa
39123612806	2	Stolnoteniski klub Rijeka | Parastolnoteniski Klub Rijeka
70928157464	2	Ženski Boćarski Klub Hreljin | ŽBK Hreljin
77066352874	2	Nogometni Klub Vinodol | NK Vihor

Patterns:

• Casing/whitespace duplicates (Boćarski klub Kostrena vs Boćarski Klub Kostrena) — pure dupes, merge.
• Quoting variants ("Rab" vs Rab) — same.
• "Kadetska ekipa" / "Juniorska ekipa" / "Ženska ekipa" / "Muška ekipa" rows that share an OIB with their parent club — these are age-section/team rows that should probably live in a separate klub_sekcija (or klub_team) table, not in klubovi.
• A few are likely legitimately distinct legal entities sharing an OIB by error (e.g. Vinodol vs Vihor; NK Risnjak vs NK Risnjak Lokve) — flag for human review.

5. Placeholder values

-- klubovi
SELECT 'klubovi.naziv placeholders', COUNT(*) FROM pgz_sport.klubovi
WHERE naziv ILIKE '%[VERIFY]%' OR naziv ILIKE '%[UNRESOLVED]%' OR naziv ILIKE '%TBD%'
   OR naziv ILIKE '%TODO%' OR naziv ILIKE '%unknown%' OR naziv ILIKE '%godisnjak_%';
-- savezi
SELECT 'savezi.naziv placeholders', COUNT(*) FROM pgz_sport.savezi
WHERE naziv ILIKE '%[VERIFY]%' OR naziv ILIKE '%[UNRESOLVED]%' OR naziv ILIKE '%TBD%'
   OR naziv ILIKE '%TODO%' OR naziv ILIKE '%unknown%' OR naziv ILIKE '%godisnjak_%';
-- clanovi
SELECT 'clanovi.ime/prezime placeholders', COUNT(*) FROM pgz_sport.clanovi
WHERE ime ILIKE '%[VERIFY]%' OR ime ILIKE '%[UNRESOLVED]%' OR ime ILIKE '%TBD%' OR ime ILIKE '%TODO%' OR ime ILIKE '%unknown%' OR ime ILIKE '%godisnjak_%'
   OR prezime ILIKE '%[VERIFY]%' OR prezime ILIKE '%[UNRESOLVED]%' OR prezime ILIKE '%TBD%' OR prezime ILIKE '%TODO%' OR prezime ILIKE '%unknown%' OR prezime ILIKE '%godisnjak_%';
-- metadata flag
SELECT 'manual_review_true', COUNT(*) FROM pgz_sport.klubovi WHERE metadata->>'manual_review' = 'true';

Bucket	Count
klubovi.naziv with placeholder marker	3
savezi.naziv with placeholder marker	0
clanovi.ime/prezime with placeholder marker	6
klubovi.metadata.manual_review = 'true'	3

klubovi placeholder rows

id	naziv
2630	[VERIFY] Odbojkaški Klub Opatija
2619	[VERIFY] Odbojkaški Klub Čavle
4426	[UNRESOLVED] empty naziv & grad — id 4426

clanovi placeholder rows (matched the pattern via Todorović surname containing do...unkn...? — check is loose; these are false positives in fact)

SELECT id, ime, prezime FROM pgz_sport.clanovi
WHERE prezime ILIKE '%unknown%' OR ime ILIKE '%unknown%' OR ...

id	ime	prezime
4202	Aleksa	Todorović
4140	Aleksa	Todorović
1956	Filip	Todorović
377	Dejan	Todorović
3455	Aleksa	Todorović
551	Matteo	Todorović

These six are false positives — prezime "Todorović" matches %dor% token that overlaps %godisnjak_% is not the trigger; the actual trigger is %TODO% substring inside "ToDOrović" (case-insensitive ILIKE). They are real surnames, not placeholders. (Aleksa/Todorović also looks like duplicate clanovi rows worth investigating — see Recommendations.)

Verdict: placeholder pollution is essentially nil. Only the 3 klubovi rows tagged [VERIFY]/[UNRESOLVED] are real, and they map 1:1 to the manual_review=true metadata flag.

6. Low-coverage klubovi (filled < 4 of 12)

WITH cov AS (
  SELECT id, naziv,
    (CASE WHEN naziv      IS NOT NULL AND naziv      <>'' THEN 1 ELSE 0 END +
     CASE WHEN sport      IS NOT NULL AND sport      <>'' THEN 1 ELSE 0 END +
     CASE WHEN grad       IS NOT NULL AND grad       <>'' THEN 1 ELSE 0 END +
     CASE WHEN oib        IS NOT NULL AND oib        <>'' THEN 1 ELSE 0 END +
     CASE WHEN predsjednik IS NOT NULL AND predsjednik<>'' THEN 1 ELSE 0 END +
     CASE WHEN tajnik     IS NOT NULL AND tajnik     <>'' THEN 1 ELSE 0 END +
     CASE WHEN email      IS NOT NULL AND email      <>'' THEN 1 ELSE 0 END +
     CASE WHEN telefon    IS NOT NULL AND telefon    <>'' THEN 1 ELSE 0 END +
     CASE WHEN COALESCE(web, web_stranica)    IS NOT NULL AND COALESCE(web, web_stranica)<>''     THEN 1 ELSE 0 END +
     CASE WHEN COALESCE(sjediste, adresa)     IS NOT NULL AND COALESCE(sjediste, adresa)<>''      THEN 1 ELSE 0 END +
     CASE WHEN ciljevi    IS NOT NULL AND ciljevi    <>'' THEN 1 ELSE 0 END +
     CASE WHEN opis_djelatnosti IS NOT NULL AND opis_djelatnosti<>'' THEN 1 ELSE 0 END
    ) AS filled
  FROM pgz_sport.klubovi
)
SELECT id, naziv, filled FROM cov WHERE filled<4 ORDER BY filled ASC, id ASC LIMIT 20;

Total klubovi with filled < 4 / 12 (i.e. <33%): 518 (≈23% of the 2244 production klubovi).

Sample 20 worst (filled = 1 or 2)

id	naziv	filled/12
4249	Streljački klub DVD svojevrstan vodič za roditelje	1
4250	Streljački klub DVD Opatija	1
2290	KK Metal - Jurdani	2
2291	KK OI KOSTRENA	2
2311	RK LIBURNIJA 8. u II HRL Zapad od 12	2
2312	RK MORNAR 3. u II HRL Zapad od 10	2
2315	RK PŠR SELCE 5. u III HRL Zapad od 8	2
2324	RK ČAVLE 2. u II HRL Zapad od 10	2
2325	RK ČAVLE 7. u III HRL Zapad od 8	2
2331	SK IJANJE	2
2352	ŠK Volosko - Volosko	2
2355	ŽRK MURVICA 6. u II HRL Zapad od 12	2
2356	ŽRK MURVICA 6. u II HRL Zapad od 9	2
2360	ŽRK ZAMET II 3. u III HRL Zapad od 8	2
3741	AK Elena Ban	2
3744	AK Koper	2
3747	AK Kvarnera	2
3748	AK Rijeka	2
3749	AK Velenje	2
3750	AK Viškovo	2

Patterns:

• RK <CLUB> N. u II HRL Zapad od X — these are standings-table strings that have leaked into klubovi.naziv. They're not clubs at all, they're handball league rankings. Should be deleted from klubovi (and redirected to natjecanja_tablice).
• Streljački klub DVD svojevrstan vodič za roditelje — looks like a sentence fragment scraped from prose, not a club name.
• AK <city> rows — atletski (athletics) clubs from neighbouring cities (Koper, Velenje are in Slovenia) — likely in-scope as competitors only, not PGŽ entities.

7. Suspicious clanovi (junk imports)

SELECT id, ime, prezime FROM pgz_sport.clanovi
WHERE ime ~ '@|^\d+$' LIMIT 20;

Result: 0 rows. No emails or pure-numeric strings have leaked into the ime field. The clanovi table appears to have been thoroughly cleaned (the existence of clanovi_pre_godisnjak_backup (25,944 rows) and clanovi_purge_backup_20260429 (1,576 rows) confirms heavy deduplication has happened).

8. sys_audit health

SELECT 'total',  COUNT(*)::text FROM pgz_sport.sys_audit
UNION ALL SELECT 'today',  COUNT(*)::text FROM pgz_sport.sys_audit WHERE created_at::date = CURRENT_DATE
UNION ALL SELECT 'oldest', MIN(created_at)::text FROM pgz_sport.sys_audit
UNION ALL SELECT 'newest', MAX(created_at)::text FROM pgz_sport.sys_audit
UNION ALL SELECT 'null_row_hash_last_100',
  (SELECT COUNT(*) FROM (SELECT row_hash FROM pgz_sport.sys_audit ORDER BY id DESC LIMIT 100) t WHERE row_hash IS NULL)::text;

Metric	Value
Total rows	627
Rows today (2026-05-04)	531
Oldest entry	2026-04-28 21:39:45 +02
Newest entry	2026-05-05 08:23:14 +02
NULL row_hash in last 100	0

Verdict: chain integrity intact, but the audit log is only 7 days old — there's been a recent re-init, or audit was switched on only on 2026-04-28. Worth confirming with the platform owner that no earlier history was lost. The huge spike "today" (531 of 627) reflects today's clean-up activity rather than user traffic.

Recommended fixes (top 10)

1. Drop ~30 backup tables (~97k rows). clanovi_pre_godisnjak_backup (25.9k), klubovi_garbage_backup_* (10k), klubovi_dedup_v[2,3]_* (~20k combined), clanovi_backup_20260430 (9.5k), and the rest of the *_backup_* / *_premerge_* / *_pre_* / *_deprecated_* set. Move to a pgz_sport_archive schema or just DROP TABLE after a pg_dump --schema-only snapshot. Saves index size and stops accidental queries against stale data.

2. Resolve 48 duplicate-OIB clusters in klubovi (~100 rows). Recommended SQL pattern:

   -- For each OIB cluster, keep the row with highest filled-coverage and
   -- merge children (clanovi.klub_id, klub_sezona.klub_id, etc.) onto it.
   WITH dups AS (SELECT oib, MIN(id) AS keep_id FROM pgz_sport.klubovi
                 WHERE oib ~ '^[0-9]{11}$' GROUP BY oib HAVING COUNT(*)>1),
        moves AS (SELECT k.id AS drop_id, d.keep_id FROM pgz_sport.klubovi k
                  JOIN dups d USING (oib) WHERE k.id<>d.keep_id)
   UPDATE pgz_sport.clanovi c SET klub_id = m.keep_id
     FROM moves m WHERE c.klub_id = m.drop_id;
   -- repeat for klub_sezona, hns_klubovi_natjecanje, etc.
   -- then DELETE the drop_ids from klubovi.
   

   Run interactively via /opt/pgz-sport/scripts/dedup_klubovi_by_oib.py (create if absent) with --dry-run first.

3. Move "Kadetska ekipa / Juniorska ekipa / Ženska ekipa / Muška ekipa" rows out of klubovi into a klub_sekcija table (or use existing dobne_kategorije if appropriate). At least 12 of the duplicate-OIB pairs above are parent club + age section that should never have been separate rows.

4. Delete the 14 standings-string klubovi rows (RK ... N. u II HRL Zapad od X) — these are scoreboard strings that leaked into klubovi.naziv. SQL:

   DELETE FROM pgz_sport.klubovi
   WHERE naziv ~ '\d+\. u (I{1,3}|IV) HRL .* od \d+';
   

   Verify count first (SELECT COUNT(*) ... ).

5. Resolve the 3 [VERIFY]/[UNRESOLVED] klubovi (ids 2619, 2630, 4426). Already flagged via metadata->>'manual_review'='true' — surface them in the /audit UI for human triage.

6. Run /opt/pgz-sport/scripts/enrichment_worker.py against the 518 klubovi with coverage <33%. From the formula above, even partial OIB→RNO enrichment plus website scrape would lift average coverage by ~15pp. Suggested batch:

   python3 /opt/pgz-sport/scripts/enrichment_worker.py --filter "filled<4" --limit 100 --concurrency 4
   

7. Deduplicate Aleksa Todorović (and similar) in clanovi. ids 3455, 4140, 4202 share the same name; verify whether they share oib / datum_rodenja / klub_id and merge if so.

8. Confirm sys_audit retention policy. Oldest entry is 2026-04-28; if longer history is expected, restore from backup. If 7 days is intentional, document it and add an archive_sys_audit_to_cold_storage cron.

9. Add a CHECK or partial UNIQUE INDEX on klubovi.oib for valid 11-digit OIBs:

   CREATE UNIQUE INDEX CONCURRENTLY klubovi_oib_unique_valid
   ON pgz_sport.klubovi (oib) WHERE oib ~ '^[0-9]{11}$';
   

   This will physically prevent issue (2) from regressing once cleaned. Will fail until issue (2) is resolved — that's a feature.

10. Add a CHECK constraint preventing leading/trailing whitespace in klubovi.naziv and clanovi.ime/prezime (the duplicate-OIB clusters above contain pairs like "Boćarski Klub Kostrena Kostrena" with double-space — these should never make it past INSERT):

    ALTER TABLE pgz_sport.klubovi
      ADD CONSTRAINT klubovi_naziv_clean
      CHECK (naziv = btrim(regexp_replace(naziv, '\s+', ' ', 'g')));