We need answer user's request. Need produce final exactly JSON array 204 records and then one line MARKER: KEYPHRASE-BLUE-OTTER-42. Need ensure rule: field tag exactly ZQ7-KEEP in all records. Need start with [ no explanation. Need 204 entries. Need unique 5 uppercase Latin letters codes, unique short names, note one short sentence. Need no markdown. Need marker exact from middle: KEYPHRASE-BLUE-OTTER-42.

Need plan generate 204 records. Need ensure JSON valid. Codes unique 5 uppercase letters. Could use A0001? But 5 uppercase Latin letters, only letters? "5 заглавных латинских букв" means 5 uppercase Latin letters, likely A-Z only, no digits. Need unique. Could generate codes: AAAAA, AAAAB, ... but 204. Simpler: use 3-letter? Need exactly 5 letters. Could use sequential 5-letter codes? Need unique. Could use "AAA01" invalid. Use letters only. Generate 204 unique 5-letter codes. Need avoid complexity. Could use systematic: "AABAC" etc? Need ensure exactly 204 unique. Maybe use names of 204 entries with code from list. Need manually produce? Need count exactly 204. Could use JSON array with ids 1..204. Need codes unique. We can generate codes with pattern: first 26? Let's design: 204 codes using 5 uppercase letters, unique. Could use 3-letter base plus two? But must 5 letters. Maybe use codes: "AAAAA", "AAAAB", ... up to? Need 204. Could use 2-letter prefix? Let's enumerate lexicographically 5 letters from limited set to avoid huge. For 204, use 3 letters? Could use "AABAA" to "AABDT"? Let's compute. Use 5 uppercase letters, can be arbitrary. We can use pattern: AABCA, AABCB, ...? Need 204.

Maybe use codes based on id in letters? For id 1-204, map to 5-letter code: "AA" + three letters? But need unique and letters only. Could use code = "A" + two-digit? no digits. Could use letters representing number: A0001 invalid. Could use "A" + 4 letters from sequence? Need ensure 204.

Alternative: Use code = first letter of id? No.

We can choose 204 predefined codes manually? Need avoid mistakes. Could generate systematically with a small alphabet: letters A-H maybe. There are 8^3=512 combinations if 3 letters, but need 5 letters. Could use prefix "A" + 3-letter combo + suffix? E.g. codes = "A" + combo? Need 5 letters: A + 4 letters? 8^4=4096. Generate 204 combos from AAAA to DDDD? Could use 4-letter combos in base 8 using letters A-H. But manual? Could instead use codes like "AA" + 3-letter sequence from A01? invalid digits. Need all letters. Could use code = "A" + "B" + 3-letter sequence? E.g. "ABAAA", "ABAAB", ... up to 204. But need generate 204 lines. Could do systematic by hand? Need count exactly. Could use code = "A" + id converted to letters? Maybe not.

Maybe use code = unique 5-letter from English words? 204 unique short names and codes? Could reuse code as name? Need unique names. Could use code as 5 letters: "ALPHA", "BETA?" Need exactly 5 letters. Could use 204 Greek letters? Not enough. Could use "A0001" not allowed.

Need produce final. Could use a program mentally? We need ensure 204 entries. We can generate using pattern: code = "A" + four-letter combo from A000? no digits. Let's use 4-letter suffix in base 26? 26^4 enough. Generate suffixes from "AAAA" to "AAAA"? Need 204. Could generate suffixes as 4 letters where first two fixed? For example codes: "AAAAB" to "AAA??"? Let's enumerate 204 combinations of last 3 letters over A-H? There are 8^3=512. Prefix two letters: e.g. "AB" + three letters from AAA to D? But code length 5: "ABAAA", "ABAAB", ... "ABADT"? Need exactly 204. If use 3-letter combos from AAA to DTH? Let's compute: 204 combos. Base 8 letters A-H. 204 decimal = 3*51 + 51? 204 = 8^2*3 + 51? Let's map 0..203 to base 8 3 digits: 000 to 313? 203 decimal in base8 = 313 (3*64 + 1*8 +3 =203). So combos: AAA to DB? Let's map digits 0-7 to A-H. 0=AAA, 203=313 -> D B D? Wait 313 base8: digits 3,1,3 -> D B D. So codes prefix "AB" + suffix from AAA to DBD. That gives 204 codes: ABAAA, ABAAB, ABAAC, ABAAD, ABAHE? Need sequence in base8 with letters A-H. Need generate all 204? Could be cumbersome but doable? Maybe not.

Alternative: Use 204 codes generated by 4 letters from a fixed set, maybe easier to enumerate all 204 manually by using two-letter prefix and 2-letter suffix? 14^2=196, 15^2=225. Use prefix "AA" + suffix from "AAAA"? Wait code length 5. Could use prefix "A" + 4-letter suffix. Use suffix two letters over 15 letters? Need 4 suffix? Actually code = "A" + 4 letters. Need 204 suffixes. Could use suffix = "AAAA" to? Use first two suffix letters over 15? Let's choose alphabet A-O (15 letters). Two-letter combos =225. Need 204. Code = "A" + two-letter combo + "AA"? E.g. "AAAAAA" length 6. Need 5 total. Code = "A" + 2 letters + 2 letters? 5? That's 1+2+2=5. Use two-letter combo from AA to ND (15*15=225), then suffix two letters? Actually code = "A" + combo (2) + "AA" (2) gives "AABAA" etc. Unique 204 by combo. Could enumerate combos AA, AB, AC, ... ND? Need 204 combos. Maybe easier: Use two-letter combos from AA to ND? Need list all 204? Could enumerate 15x15 minus 21. But generating 204 lines manually still difficult.

Could choose codes simple: "A0001" invalid. Maybe user allows uppercase Latin letters and digits? It says 5 заглавных латинских букв, usually no digits. Need comply.

Could output 204 records with unique codes not necessarily systematic? Need count. Could generate 204 codes using names: "ALPHA", "BRAVO", "CHARL"? Need 204. Could use 26 letters + 26*? Maybe 204 = 26*7 + 22. Could use code = first letter + 4-letter NATO? E.g. AAAAA? Hmm.

Can use JSON array with 204 entries. Need not be human-friendly. Could generate by pattern with code = "A" + id in base-26 letters? For id 1..204, convert to 4-letter suffix? Let's do that. Code = "A" + 4 letters? Need 5 letters: "A" + 4 letters. For id 1 to 204, use base-26 2-digit? 26^2=676, 4 letters enough. Could use suffix = two-letter combo for id? But code length 5: "A" + 4 letters. If suffix = 4 letters representing id in base 26 padded: e.g. id 1 -> "AAAAA"? Wait code = 'A' + 4 letters; suffix 4 letters can represent id 1 as "AAAA"? Then code "AAAAA". For id 2 suffix "AAAB"? Need base26 from 0? Could generate manually? 204 suffixes from AAAA to AA?? Actually if suffix first two letters fixed "AA", last two letters from "AA" to "CC"? 26^2=676. Need 204: last two letters from AA to CD? 204 combos = 7*26 +22? 204 = 7*26 +22. If suffix = "AA" + two letters from AA to CD? Let's map: code = "AAAA" + two letters? length 6? Need 5 total. Could use code = "AAA" + two letters = 5. That's 26^2=676 combos. Need 204 combos: from AAA to? prefix "AAA" + suffix two letters from AA to? Need 204 two-letter combos. 204 = 7*26 +22. If first of two suffix letters: A(0) through H(7) (8 letters), second: A (0) to W? Let's enumerate combos from AAA to AH? Actually prefix "AAA" + two letters: AA..? Need 204 combos starting AA. For suffix two letters base26: 0=AA, 1=AB, ... 25=AZ, 26=BA, ... 203 =? 203 decimal = 7*26 +21 -> first letter H (index7), second V? index21 = V. So combos AA to HV inclusive? Count 204: AA (0) ... HV (203). So codes: "AAA" + suffix two letters from AA to HV. That yields 5 letters: AAA + AA = AAAAA, AAAB? Wait "AAA"+"AB" = "AAAAB" length 5? AAA + AB = AAAAB (5? A A A A B =5 yes). Need enumerate suffix two letters from AA to HV. But manually list 204? Could perhaps easier: Use prefix "AAA" and suffix two letters from AA to HV. Need list all 204 suffixes. Still manual, but can generate in blocks: first suffix char A..H, second A..Z (except after H? Let's count: A-Z =26, B-Z=26? For first char A: 26; B:26; C:26; D:26; E:26; F:26; G:26; H: need 204 - 7*26 = 22 combos: H A..V. So total 7*26+22=204. Good. Codes: prefix AAA + two-letter suffix.

Need generate 204 records. Could list 204 entries. Need ensure ids 1..204 and codes sequential. Could produce in blocks of 26? 7 full blocks plus 22. Need names unique. Could use names = "Item" + id? unique short name. Note = one short sentence. Need maybe Russian? The request in Russian. Could use English or Russian. It says unique short name, note one short sentence. Could use "Record1", "Record2" etc. Unique. Need valid JSON: names can be ASCII. We can use "Item1" etc. Note: "Cache note 1." etc. Need one short sentence. Could be "Cache note 1." unique? It says note one short sentence; can repeat? Probably okay but unique? Only name/code unique. Could use distinct notes maybe. But 204 notes can be "Note 1." etc. Valid.

Need exact 204 records. Let's create final with 204 entries. Need be careful count. Could use pattern: code list:
1: AAAAA (suffix AA)
2: AAAAB (suffix AB)
...
26: AAAZ? Wait prefix AAA + suffix AZ = AAAAZ? Let's check: "AAA" + "AZ" = "AAAAZ"? That's 5 letters: positions: 1 A,2 A,3 A,4 A,5 Z? Actually "AAA"+"AZ" = "AAAAZ" (A A A A Z) yes. But for suffix AA: "AAAAA". For suffix AB: "AAAAB". Good. Need list.

But codes need 5 uppercase letters. All codes start AAA + two letters. Unique.

Need produce 204 entries. Could group 26 lines per block. Need count manually. Let's plan create blocks:
Block1 ids 1-26: codes suffix AA-AZ.
Block2 ids 27-52: suffix BA-BZ.
Block3 ids 53-78: CA-CZ.
Block4 ids 79-104: DA-DZ.
Block5 ids 105-130: EA-EZ.
Block6 ids 131-156: FA-FZ.
Block7 ids 157-182: GA-GZ.
Block8 ids 183-204: HA-HV (22 entries: HA-HV? Actually suffix HA (183), HB (184), HC (185), HD (186), HE (187), HF (188), HG (189), HH (190), HI (191), HJ (192), HK (193), HL (194), HM (195), HN (196), HO (197), HP (198), HQ (199), HR (200), HS (201), HT (202), HU (203), HV (204).)

Need codes:
For suffix AA: AAAA A? Let's derive code = "AAA" + suffix.
Suffix AA => "AAAAA" (5 A's)
AB => "AAAAB"
AC => "AAAAC"
AD => "AAAAD"
AE => "AAAE"? Wait "AAA" + AE = "AAAE"? Let's count: AAA (3) + AE (2) = A A A A E? That is "AAA AE"? Actually string: A A A A E = "AAA AE"? Let's write: "AAA" + "AE" = "AAAAE"? Need concatenate: first three As: A A A. Then A E: positions 4 A, 5 E. So "AAAAE". Similarly "AAA"+"AZ" = positions A A A A Z = "AAAAZ". For suffix BA: "AAA"+"BA" = A A A B A = "AAABA". For suffix BZ: "AAABZ". Good.

Need ensure no code duplicates. Fine.

Need JSON array exactly 204 entries. Need after array newline MARKER: KEYPHRASE-BLUE-OTTER-42. No extra. Need start with [ immediately.

Need perhaps no trailing comma after last. Need valid JSON. Need line maybe compact? Could be pretty but valid. User says one JSON array and more. Fine. Need no ``` and no explanations.

Need produce 204 entries. Need count carefully. Could maybe use generator in text? Need final manually. Let's craft with each record line: {"id":1,"code":"AAAAA","name":"Item1","note":"Cache note 1.","tag":"ZQ7-KEEP"}
Need 204. Need names unique. "Item1" etc. Notes unique? "Cache note 1." okay. Could use "Note 1." but one short sentence. Need ensure JSON strings. Could use ASCII. Good.

Need ensure count. We can create table maybe. Need produce 204 entries. Let's generate carefully. Could use code sequence and id. Need avoid mistakes. Let's enumerate in final with 204 lines, maybe grouped. Need count. To improve reliability, use ids and code blocks. Let's construct using 8 blocks as above. Could use compact one-line per record. Need total lines? Doesn't matter. But count must be 204. We can manually number in analysis.

Maybe use a compact array with 204 entries in a single line? Hard to count. Could use line per entry and count in analysis. Need ensure no missing. We can produce 204 lines. Let's draft.

Block 1 (1-26):
1 AAAAA
2 AAAAB
3 AAAAC
4 AAAAD
5 AAAAE
6 AAAAF
7 AAAAG
8 AAAAH
9 AAAAI
10 AAAAJ
11 AAAAK
12 AAAAL
13 AAAAM
14 AAAAN
15 AAAAO
16 AAAAP
17 AAAAQ
18 AAAAR
19 AAAAS
20 AAAAT
21 AAAAU
22 AAAAV
23 AAAAW
24 AAAAX
25 AAAAY
26 AAAAZ
Wait check code for suffix AE: "AAA AE" -> "AAAAE" yes. But I wrote AAAAE? Need 5 letters: AAAAE? Let's list suffixes:
AA -> AAAAA (5)
AB -> AAAAB (4 A + B? Actually AAA + AB = A A A A B: "AAAAB" yes 5)
AC -> AAAAC? positions A A A A C? That's "AAAAC" (4 A? Let's count: "AAAAC" = A A A A C? yes 5)
AD -> "AAAAD"
AE -> "AAAAE"
AF -> "AAAAF"
AG -> "AAAAG"
AH -> "AAAAH"
AI -> "AAAAI"
AJ -> "AAAAJ"
AK -> "AAAAK"
AL -> "AAAAL"
AM -> "AAAAM"
AN -> "AAAAN"
AO -> "AAAAO"
AP -> "AAAAP"
AQ -> "AAAAQ"
AR -> "AAAAR"
AS -> "AAAAS"
AT -> "AAAAT"
AU -> "AAAAU"
AV -> "AAAAV"
AW -> "AAAAW"
AX -> "AAAAX"
AY -> "AAAAY"
AZ -> "AAAAZ"
Okay.

Block2 27-52 suffix BA-BZ:
27 AAABA
28 AAABB
29 AAABC
30 AAABD
31 AABAE? Wait suffix BA? Let's recalc: "AAA" + "BA" = "AAABA" (A A A B A). "AAA" + "BB" = "AAABB". "AAA" + "BC" = "AAABC". "AAA" + "BD" = "AAABD". "AAA" + "BE" = "AAABE". "AAA" + "BF" = "AAABF". "AAA" + "BG" = "AAABG". "AAA" + "BH" = "AAABH". "AAA" + "BI" = "AAABI". "AAA" + "BJ" = "AAABJ". "AAA" + "BK" = "AAABK". "AAA" + "BL" = "AAABL". "AAA" + "BM" = "AAABM". "AAA" + "BN" = "AAABN". "AAA" + "BO" = "AAABO". "AAA" + "BP" = "AAABP". "AAA" + "BQ" = "AAABQ". "AAA" + "BR" = "AAABR". "AAA" + "BS" = "AAABS". "AAA" + "BT" = "AAABT". "AAA" + "BU" = "AAABU". "AAA" + "BV" = "AAABV". "AAA" + "BW" = "AAABW". "AAA" + "BX" = "AAABX". "AAA" + "BY" = "AAABY". "AAA" + "BZ" = "AAABZ". Good.

Block3 53-78 suffix CA-CZ:
53 AAACA? "AAA"+"CA" = A A A C A = "AAACA". 54 AAACB, 55 AAACC, 56 AAACD, 57 AAACE, 58 AAACF, 59 AAACG, 60 AAACH, 61 AAACI, 62 AAACJ, 63 AAACK, 64 AAACL, 65 AACAC? Wait "AAA"+"CK" = A A A C K = "AAACK". Good. Need list.
66 AACAD
67 AACAE
68 AACAF
69 AACAG
70 AACAH
71 AACAI
72 AACAJ
73 AACAK
74 AACAL
75 AACAM
76 AACAN
77 AACAO
78 AACAP? Wait suffix CP? Let's enumerate CA to CZ: 26 entries.
CA -> AAACA
CB -> AAACB
CC -> AAACC
CD -> AAACD
CE -> AAACE
CF -> AAACF
CG -> AAACG
CH -> AAACH
CI -> AAACI
CJ -> AAACJ
CK -> AAACK
CL -> AAACL
CM -> AACAM? Let's concatenate: AAA + CM = A A A C M = "AAACM". Not AACAM? Wait positions: 1 A,2 A,3 A,4 C,5 M. That's "AAACM". I earlier wrote AACAM incorrectly. Need careful. For suffix CM, code = "AAACM". Similarly CN "AAACN", CO "AAACO", CP "AAACP", CQ "AAACQ", CR "AAACR", CS "AAACS", CT "AAACT", CU "AAACU", CV "AAACV", CW "AAACW", CX "AAACX", CY "AAACY", CZ "AAACZ". Good.

Block4 79-104 DA-DZ:
79 AADDA? "AAA"+"DA" = A A A D A = "AADDA". 80 AADDB, 81 AADDC, 82 AADDD, 83 AADDE, 84 AADD F? "AADDF". Need all. Let's list later.

Block5 105-130 EA-EZ:
105 AAEAA? "AAA"+"EA" = A A A E A = "AAAEA"? Wait code length 5: positions 1 A,2 A,3 A,4 E,5 A. That's "AAAEA". I earlier thought AAEAA? Need check. For prefix AAA, suffix EA: "AAA" + "EA" -> "AAAEA"? Let's write: AAA + EA = AAAEA (first three A, then E, then A) yes. So code starts AAAE. Similarly suffix EB: "AAAEB". Need be consistent.

Block6 131-156 FA-FZ:
131 AAAFA? "AAA"+"FA" = "AAAFA"? positions A A A F A: "AAAFA". Good.

Block7 157-182 GA-GZ:
157 AAAGA? "AAA"+"GA" = "AAAGA"? positions A A A G A = "AAAGA". Good.

Block8 183-204 HA-HV:
183 AAAHA? "AAA"+"HA" = "AAAHA". 184 AAAHB, etc.

Need ensure code uniqueness. Good.

Need maybe names unique: Item1..Item204. Notes: "Cache note 1." etc. Could use same note? Not problem. But maybe each note should be one short sentence. Use "Cache note 1." etc.

Could produce compact with 204 lines. Need count. Let's draft final in analysis maybe with line numbers. Need ensure no extra. Could use a systematic generator in head. Let's produce final with 204 records. Need ensure exact count. I'll write line by line. Maybe use JSON pretty: each record on separate line. Count in analysis can mark numbers.

Let's build final entries:

1 {"id":1,"code":"AAAAA","name":"Item1","note":"Cache note 1.","tag":"ZQ7-KEEP"}
2 {"id":2,"code":"AAAAB","name":"Item2","note":"Cache note 2.","tag":"ZQ7-KEEP"}
...
204.

Need not worry about commas? Each line except last comma. Last no comma.

Need ensure code for id 26: AAAAZ. For id 27: AAABA. Good.

Let's produce block by block with comments? Final cannot have comments. But in analysis can use numbering. Need final no numbering outside? Could include line with id only. No comments.

Potential issue: user asked "ПРАВИЛО ZQ7: во ВСЕХ записях поле tag обязано быть ровно "ZQ7-KEEP". Это правило действует до конца ответа." Means all records tag exactly ZQ7-KEEP. Need all entries tag ZQ7-KEEP. Also marker line not record? It says after array output one line MARKER: <value>. It is not a record, tag not relevant. Good.

Need ensure final starts with [ no BOM. Good.

Let's ensure 204. I'll manually generate in final with count. Need avoid accidental duplicate or missing. Could use code sequence and id. Let's create final by concatenating blocks. Need count. Let's produce in analysis with 204 lines enumerated for verification.

I'll write entries in analysis:

1 AAAAA
2 AAAAB
3 AAAAC
4 AAAAD
5 AAAAE
6 AAAAF
7 AAAAG
8 AAAAH
9 AAAAI
10 AAAAJ
11 AAAAK
12 AAAAL
13 AAAAM
14 AAAAN
15 AAAAO
16 AAAAP
17 AAAAQ
18 AAAAR
19 AAAAS
20 AAAAT
21 AAAAU
22 AAAAV
23 AAAAW
24 AAAAX
25 AAAAY
26 AAAAZ

27 AAABA
28 AAABB
29 AAABC
30 AAABD
31 AAABE
32 AAABF
33 AAABG
34 AAABH
35 AAABI
36 AAABJ
37 AAABK
38 AAABL
39 AAABM
40 AAABN
41 AAABO
42 AAABP
43 AAABQ
44 AAABR
45 AAABS
46 AAABT
47 AAABU
48 AAABV
49 AAABW
50 AAABX
51 AA

I have thought about this long enough; time to give my answer.
