build: release version 4.4.8-ba7opf.11.5 (580)

整批记录都被呼号冲突挡住（0 条可传）时，统计闸门直接弹「N QSO(s) can't be uploaded」
消息并返回，带【改写为…】【换一张证书】两个动作的预览弹窗根本走不到，那批记录无从
处理。现在只要原因里有呼号冲突就放行到预览：0 条可传也出预览（显示 0 QSO(s) + 冲突
提示 + 两个动作），上传键置灰——以前点确认会返回“预览已过期”。其它原因的 0 条可传
批次保持原消息弹窗不变。

「MY callsign does not match the certificate」的示例值由某条记录的对方呼号改为
「记录呼号 ≠ 证书呼号」，把需要协调的两个值都打出来（旧文案读起来像证书呼号）。

空预览不再显示空的日期区间。

新增 LoTWUploadMessagesTest 3 例：冲突批量必须进预览、无冲突的 0 条可传批次保持消息、
有待传记录时不走冲突兜底；仓库层用例新增：全阻批量仍返回带冲突清单的预览、且无载荷
时确认安全地按“过期”失败。

core/data/src/main/java/com/rtbishop/look4sat/core/data/lotw/LoTWKeyMaterial.kt

@@ -33,53 +33,38 @@ import java.util.TimeZone
 
 internal data class LoTWKeyMaterial(val key: PrivateKey, val certificate: X509Certificate, val info: LoTWCertificate) {
     companion object {
-        fun read(bytes: ByteArray, password: CharArray, now: Long): LoTWKeyMaterial {
+        /**
+         * Reads the private key and certificate out of a TrustedQSL .p12 backup.
+         *
+         * The platform PKCS12 parser is tried first because it resolves the certificate that
+         * belongs to the key entry. When it cannot deliver a usable pair — it may refuse the file
+         * outright (older Android cannot read PBES2 at all) or accept the container yet expose no
+         * key entry (Conscrypt/OpenSSL reads PBES2 but fails to recover the key of, for example,
+         * an empty-password backup) — our own PBES2 reader is consulted before reporting a problem,
+         * so a valid certificate is not rejected as "not a valid LoTW certificate file".
+         *
+         * [platformStore] is a seam that lets tests simulate a platform which accepts the file
+         * without exposing any key entry.
+         */
+        internal fun read(
+            bytes: ByteArray,
+            password: CharArray,
+            now: Long,
+            platformStore: (ByteArray, CharArray) -> KeyStore? = { data, pass -> loadPlatformStore(data, pass) },
+        ): LoTWKeyMaterial {
             if (bytes.isEmpty() || bytes.size > MAX_CERTIFICATE_BYTES) fail(LoTWProblem.CERTIFICATE_INVALID)
             val key: PrivateKey
             val cert: X509Certificate
-            val store = try {
-                KeyStore.getInstance("PKCS12").apply { bytes.inputStream().use { load(it, password) } }
-            } catch (_: Exception) {
-                // Modern TQSL / OpenSSL 3 exports use PBES2+AES-CBC which Android's legacy
-                // Bouncy Castle parser cannot read. Fall back to our own PBES2 reader; if
-                // that fails too, report the real reason (format vs password).
-                if (isPbes2(bytes)) {
-                    try {
-                        val parsed = Pkcs12Reader.read(bytes, password)
-                        parsed.first to parsed.second
-                    } catch (e: Exception) {
-                        // Classify by exception type so the user sees the right message:
-                        //  - BadPadding (BAD_DECRYPT)          -> wrong password
-                        //  - IllegalStateException (error())    -> unsupported algorithm,
-                        //    message is the algorithm name
-                        //  - IllegalArgumentException (require()) -> structurally invalid file
-                        fail(
-                            when {
-                                e is javax.crypto.BadPaddingException -> LoTWProblem.CERTIFICATE_PASSWORD
-                                e is IllegalStateException && password.isNotEmpty() -> LoTWProblem.CERTIFICATE_FORMAT
-                                else -> LoTWProblem.CERTIFICATE_INVALID
-                            },
-                            if (e is IllegalStateException) (e.message ?: "") else ""
-                        )
-                    }
-                } else {
-                    fail(LoTWProblem.CERTIFICATE_PASSWORD)
-                }
-            }
-            if (store is Pair<*, *>) {
-                @Suppress("UNCHECKED_CAST")
-                key = store.first as PrivateKey
-                @Suppress("UNCHECKED_CAST")
-                cert = store.second as X509Certificate
+            val outcome = platformStore(bytes, password)?.let { platformKeyAndCertificate(it, password) }
+            if (outcome is PlatformOutcome.Ok) {
+                key = outcome.key
+                cert = outcome.certificate
+            } else if (isPbes2(bytes)) {
+                val parsed = readWithPbes2Reader(bytes, password)
+                key = parsed.first
+                cert = parsed.second
             } else {
-                val ks = store as KeyStore
-                val aliases = Collections.list(ks.aliases()).filter { ks.isKeyEntry(it) }
-                if (aliases.size != 1) fail(LoTWProblem.CERTIFICATE_INVALID)
-                val alias = aliases.single()
-                key = try { ks.getKey(alias, password) as? PrivateKey }
-                catch (_: Exception) { fail(LoTWProblem.CERTIFICATE_PASSWORD) }
-                    ?: fail(LoTWProblem.CERTIFICATE_INVALID)
-                cert = ks.getCertificate(alias) as? X509Certificate ?: fail(LoTWProblem.CERTIFICATE_INVALID)
+                fail((outcome as? PlatformOutcome.Unusable)?.problem ?: LoTWProblem.CERTIFICATE_PASSWORD)
             }
             if (key.algorithm != "RSA" || cert.publicKey.algorithm != "RSA") fail(LoTWProblem.CERTIFICATE_INVALID)
             try { cert.checkValidity(Date(now)) } catch (_: Exception) { fail(LoTWProblem.CERTIFICATE_EXPIRED) }
@@ -92,6 +77,54 @@ internal data class LoTWKeyMaterial(val key: PrivateKey, val certificate: X509Ce
             return LoTWKeyMaterial(key, cert, info)
         }
 
+        /** What the platform PKCS12 parser managed to deliver for the key entry. */
+        private sealed interface PlatformOutcome {
+            data class Ok(val key: PrivateKey, val certificate: X509Certificate) : PlatformOutcome
+
+            /** The problem the platform path would have reported on its own. */
+            data class Unusable(val problem: LoTWProblem) : PlatformOutcome
+        }
+
+        /** The platform PKCS12 keystore, or null when it refuses to read the file at all. */
+        private fun loadPlatformStore(bytes: ByteArray, password: CharArray): KeyStore? = try {
+            KeyStore.getInstance("PKCS12").apply { bytes.inputStream().use { load(it, password) } }
+        } catch (_: Exception) {
+            null
+        }
+
+        /** Resolves the single key entry the platform offers, keeping its own failure reasons. */
+        private fun platformKeyAndCertificate(store: KeyStore, password: CharArray): PlatformOutcome {
+            val aliases = Collections.list(store.aliases()).filter { store.isKeyEntry(it) }
+            val alias = aliases.singleOrNull() ?: return PlatformOutcome.Unusable(LoTWProblem.CERTIFICATE_INVALID)
+            val key = try {
+                store.getKey(alias, password) as? PrivateKey
+            } catch (_: Exception) {
+                return PlatformOutcome.Unusable(LoTWProblem.CERTIFICATE_PASSWORD)
+            } ?: return PlatformOutcome.Unusable(LoTWProblem.CERTIFICATE_INVALID)
+            val certificate = store.getCertificate(alias) as? X509Certificate
+                ?: return PlatformOutcome.Unusable(LoTWProblem.CERTIFICATE_INVALID)
+            return PlatformOutcome.Ok(key, certificate)
+        }
+
+        /** Our own PBES2 reader, mapping failures onto the message the operator should see. */
+        private fun readWithPbes2Reader(bytes: ByteArray, password: CharArray): Pair<PrivateKey, X509Certificate> = try {
+            Pkcs12Reader.read(bytes, password)
+        } catch (e: Exception) {
+            // Classify by exception type so the user sees the right message:
+            //  - BadPadding (BAD_DECRYPT)          -> wrong password
+            //  - IllegalStateException (error())    -> unsupported algorithm,
+            //    message is the algorithm name
+            //  - IllegalArgumentException (require()) -> structurally invalid file
+            fail(
+                when {
+                    e is javax.crypto.BadPaddingException -> LoTWProblem.CERTIFICATE_PASSWORD
+                    e is IllegalStateException && password.isNotEmpty() -> LoTWProblem.CERTIFICATE_FORMAT
+                    else -> LoTWProblem.CERTIFICATE_INVALID
+                },
+                if (e is IllegalStateException) (e.message ?: "") else ""
+            )
+        }
+
         /** True when the PKCS12 uses PBES2 (OID 1.2.840.113549.1.5.13), the default
          *  algorithm of OpenSSL 3 / modern TQSL. Android's legacy BC parser can't read it. */
         private fun isPbes2(bytes: ByteArray): Boolean {

core/data/src/main/java/com/rtbishop/look4sat/core/data/lotw/LoTWSigner.kt

@@ -37,7 +37,12 @@ internal class LoTWSigner(private val config: LoTWConfig) {
         val call = record.theirCallsign.trim().uppercase(Locale.US)
         if (record.status != QsoStatus.COMPLETE || !call.matches(Regex("[A-Z0-9]+(/[A-Z0-9]+)*")) ||
             !call.any(Char::isLetter) || !call.any(Char::isDigit)) fail(LoTWProblem.INVALID_CONTACT, call)
-        if (!record.myCallsign.trim().equals(key.info.callsign, true)) fail(LoTWProblem.CALLSIGN_MISMATCH, call)
+        // Report the two callsigns the operator has to reconcile (record vs certificate). A generic
+        // sample — the opposite station's call — says nothing about which side is wrong, which is
+        // exactly what a "MY callsign does not match the certificate" message must tell.
+        if (!record.myCallsign.trim().equals(key.info.callsign, true)) {
+            fail(LoTWProblem.CALLSIGN_MISMATCH, "${record.myCallsign.trim()} ≠ ${key.info.callsign}")
+        }
         val date = utc(record.startUtcMillis, "yyyy-MM-dd")
         // A record dated after "now" gets its own message: it happens when the operator
         // logged against a pass that had not started yet (out-of-window flow), and "fix the

core/data/src/main/java/com/rtbishop/look4sat/core/data/lotw/LoTWUploadRepository.kt

@@ -267,16 +267,29 @@ class LoTWUploadRepository internal constructor(
             var duplicates = 0
             val unique = hashSetOf<String>()
             val reasons = mutableMapOf<LoTWProblem, Int>()
+            val certificateCallsign = signing.key.info.callsign
+            val substitutedIds = mutableSetOf<Long>()
+            val callsignConflicts = mutableListOf<Long>()
             val contacts = records.sortedBy { it.startUtcMillis }.mapNotNull { record ->
                 coroutineContext.ensureActive()
                 if (record.status != QsoStatus.COMPLETE || ((record.lotwReceived || record.lotwUploaded) && !resubmit)) { skipped++; return@mapNotNull null }
+                // A record logged while no certificate was installed carries no own callsign: sign
+                // it with the certificate's callsign (the preview says so, and an accepted upload
+                // writes the callsign into the record). A record naming a DIFFERENT callsign may be
+                // someone else's contact, so it stays refused — the conflict list lets the operator
+                // rewrite those records or import the other certificate.
+                val signable = if (record.myCallsign.isBlank()) {
+                    substitutedIds += record.id
+                    record.copy(myCallsign = certificateCallsign)
+                } else record
                 val contact = try {
-                    signing.signer.contact(record, signing.key, signing.location, now())
+                    signing.signer.contact(signable, signing.key, signing.location, now())
                 } catch (e: LoTWOperationException) {
                     // One un-signable record must not abort the whole batch:
                     // skip it, count the real reason, and let the rest upload.
                     unavailable++
                     reasons[e.reason] = (reasons[e.reason] ?: 0) + 1
+                    if (e.reason == LoTWProblem.CALLSIGN_MISMATCH) callsignConflicts += record.id
                     return@mapNotNull null
                 }
                 val previous = ledger[contact.fingerprint]
@@ -299,6 +312,7 @@ class LoTWUploadRepository internal constructor(
                 signing.location["MY_VUCC_GRIDS"]?.split(',')
                     ?.map(String::trim)?.filter(String::isNotBlank)?.let(::addAll)
             }.distinct()
+            val submittedIds = contacts.map { it.record.id }
             val preview = LoTWUploadPreview(
                 UUID.randomUUID().toString(), signing.key.info.callsign, signing.key.info.dxcc, signing.location.getValue("GRIDSQUARE"),
                 contacts.size, skipped,
@@ -309,9 +323,12 @@ class LoTWUploadRepository internal constructor(
                 unavailable,
                 reasons.toMap(),
                 duplicates,
-                contacts.map { it.record.id },
+                submittedIds,
                 locationGrids,
-                resubmit
+                resubmit,
+                // Only the callsign-filled records that actually made it into this batch are reported.
+                submittedIds.count { it in substitutedIds },
+                callsignConflicts
             )
             if (contacts.isNotEmpty()) pending = Pending(
                 preview,

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/QsoRepository.kt

@@ -82,18 +82,39 @@ class QsoRepository(
 
     override suspend fun delete(id: Long) = withContext(dispatcher) { importMutex.withLock { dao.delete(id) } }
 
-    override suspend fun markUploaded(ids: List<Long>, grids: List<String>) = withContext(dispatcher) {
+    override suspend fun markUploaded(ids: List<Long>, grids: List<String>, certificateCallsign: String) = withContext(dispatcher) {
         if (ids.isEmpty()) return@withContext
         dao.markUploaded(ids)
         // Stamp the station grid set this batch went out under (a line/corner prefill from
         // the grid finder carries 2–4 grids). The logbook row shows it after the timestamp.
         val normalized = grids.map { it.trim().uppercase(Locale.US).take(4) }
             .filter { it.length >= 4 }.distinct().sorted()
-        if (normalized.isEmpty()) return@withContext
-        val stamped = ids.mapNotNull { id ->
-            dao.find(id)?.toDomain()?.takeIf { it.vuccGrids != normalized }?.copy(vuccGrids = normalized)
+        if (normalized.isNotEmpty()) {
+            val stamped = ids.mapNotNull { id ->
+                dao.find(id)?.toDomain()?.takeIf { it.vuccGrids != normalized }?.copy(vuccGrids = normalized)
+            }
+            if (stamped.isNotEmpty()) dao.saveBatch(stamped.map { it.toEntity() })
         }
-        if (stamped.isNotEmpty()) dao.saveBatch(stamped.map { it.toEntity() })
+        // Records logged while no certificate was installed carry no own callsign; they were just
+        // signed with the certificate's, so write it into them. Blanks only, and through save() so
+        // the stored dedupe key follows the new value.
+        if (certificateCallsign.isNotBlank()) {
+            ids.mapNotNull { id -> dao.find(id)?.toDomain()?.takeIf { it.myCallsign.isBlank() } }
+                .forEach { save(it.copy(myCallsign = certificateCallsign.trim().uppercase(Locale.US))) }
+        }
+    }
+
+    override suspend fun rewriteMyCallsign(ids: List<Long>, callsign: String): Int = withContext(dispatcher) {
+        val target = callsign.trim().uppercase(Locale.US)
+        if (ids.isEmpty() || target.isBlank()) return@withContext 0
+        var changed = 0
+        ids.forEach { id ->
+            val record = dao.find(id)?.toDomain() ?: return@forEach
+            if (record.myCallsign.trim().equals(target, true)) return@forEach
+            save(record.copy(myCallsign = target))
+            changed++
+        }
+        changed
     }
 
     override suspend fun markWavelogUploaded(ids: List<Long>, stationId: String) = withContext(dispatcher) {

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/SelectionRepo.kt

@@ -66,8 +66,17 @@ class SelectionRepo(
         }
     }
 
+    // Selected satellites are pinned to the top (matches upstream); ordering
+    // within each group stays name/catnum. Sits on the reactive chain, so
+    // ticking an entry re-sorts the visible list immediately.
     private val itemsWithQuery = currentQuery.flatMapLatest { query ->
-        itemsWithTypes.map { items -> filterByQuery(items, query) }
+        itemsWithTypes.map { items ->
+            filterByQuery(items, query).sortedWith(
+                compareByDescending<SatItem> { it.isSelected }
+                    .thenBy { it.name }
+                    .thenBy { it.catnum }
+            )
+        }
     }
 
     override fun getCurrentTypes() = currentTypes.value

core/data/src/test/java/com/rtbishop/look4sat/core/data/lotw/LoTWKeyMaterialTest.kt

@@ -0,0 +1,95 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.rtbishop.look4sat.core.data.lotw
+
+import com.rtbishop.look4sat.core.domain.repository.LoTWOperationException
+import com.rtbishop.look4sat.core.domain.repository.LoTWProblem
+import java.io.InputStream
+import java.security.KeyStore
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertThrows
+import org.junit.Test
+
+/**
+ * Certificate import must not depend on the platform PKCS12 parser. Android's parser accepts a
+ * modern TQSL PBES2 export but can expose no key entry for it (observed with an empty-password
+ * backup, which was then rejected as "not a valid LoTW certificate file" although every field of
+ * the certificate is readable). These tests pin the fallback to our own PBES2 reader.
+ */
+class LoTWKeyMaterialTest {
+
+    private fun fixture(name: String): ByteArray =
+        javaClass.classLoader!!.getResourceAsStream(name)!!.use { it.readBytes() }
+
+    /** Stands in for a platform that parsed the container but offers no private-key entry. */
+    private fun storeWithoutKeyEntry(): KeyStore = KeyStore.getInstance("PKCS12").apply {
+        load(null as InputStream?, null as CharArray?)
+    }
+
+    private val now = System.currentTimeMillis()
+
+    /** TQSL-style backup (empty password) imported although the platform delivers no key entry. */
+    @Test
+    fun importsCertificateWhenPlatformExposesNoKeyEntry() {
+        val material = LoTWKeyMaterial.read(
+            bytes = fixture("test_tqsl_empty.p12"),
+            password = charArrayOf(),
+            now = now,
+            platformStore = { _, _ -> storeWithoutKeyEntry() },
+        )
+        assertEquals("BA7OPF", material.info.callsign)
+        assertEquals(318, material.info.dxcc)
+        assertEquals("2026-01-01", material.info.firstQsoDate)
+    }
+
+    /** The same backup still imports when the platform is the one that resolves the key entry. */
+    @Test
+    fun importsCertificateThroughPlatformWhenAvailable() {
+        val material = LoTWKeyMaterial.read(fixture("test_tqsl_empty.p12"), charArrayOf(), now)
+        assertEquals("BA7OPF", material.info.callsign)
+    }
+
+    /** A wrong password is still reported as a password problem, not as an invalid file. */
+    @Test
+    fun reportsWrongPasswordForPbes2Backup() {
+        val error = assertThrows(LoTWOperationException::class.java) {
+            LoTWKeyMaterial.read(fixture("test_tqsl_empty.p12"), "wrong-password".toCharArray(), now)
+        }
+        assertEquals(LoTWProblem.CERTIFICATE_PASSWORD, error.reason)
+    }
+
+    /** Something that is not a PKCS12 at all keeps the message the platform path produced. */
+    @Test
+    fun refusesNonPkcs12File() {
+        val error = assertThrows(LoTWOperationException::class.java) {
+            LoTWKeyMaterial.read("not a p12 at all".toByteArray(), "x".toCharArray(), now) { _, _ -> null }
+        }
+        assertEquals(LoTWProblem.CERTIFICATE_PASSWORD, error.reason)
+    }
+
+    /** Oversized input is rejected before any parser runs. */
+    @Test
+    fun refusesOversizedInput() {
+        val bytes = ByteArray(MAX_CERTIFICATE_BYTES + 1)
+        val error = assertThrows(LoTWOperationException::class.java) {
+            LoTWKeyMaterial.read(bytes, charArrayOf(), now) { _, _ -> storeWithoutKeyEntry() }
+        }
+        assertEquals(LoTWProblem.CERTIFICATE_INVALID, error.reason)
+    }
+}

core/data/src/test/java/com/rtbishop/look4sat/core/data/lotw/LoTWUploadRepositoryPreviewTest.kt

@@ -17,8 +17,13 @@
  */
 package com.rtbishop.look4sat.core.data.lotw
 
+import com.rtbishop.look4sat.core.domain.logbook.QsoRecord
+import com.rtbishop.look4sat.core.domain.logbook.QsoStatus
 import com.rtbishop.look4sat.core.domain.repository.LoTWOperationException
 import com.rtbishop.look4sat.core.domain.repository.LoTWProblem
+import com.rtbishop.look4sat.core.domain.repository.LoTWStation
+import com.rtbishop.look4sat.core.domain.repository.LoTWUploadResult
+import java.io.File
 import kotlinx.coroutines.runBlocking
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertNull
@@ -39,7 +44,9 @@ class LoTWUploadRepositoryPreviewTest {
 
     private class MemStorage : LoTWStorage {
         val files = mutableMapOf<String, ByteArray>()
-        override fun read(name: String): ByteArray? = files[name]
+        // Reads hand out their own copy, like the file-backed storage does: several call sites
+        // wipe what they read, and that must not corrupt the stored bytes.
+        override fun read(name: String): ByteArray? = files[name]?.copyOf()
         override fun write(name: String, data: ByteArray) { files[name] = data.copyOf() }
         override fun delete(name: String) { files.remove(name) }
     }
@@ -79,4 +86,104 @@ class LoTWUploadRepositoryPreviewTest {
             assertTrue("nothing written", storage.files.isEmpty())
         }
     }
+
+    /**
+     * Records logged before a certificate was installed (blank own callsign) or under another
+     * certificate are signed with the certificate's callsign instead of being refused, and the
+     * preview reports how many they were.
+     */
+    @Test
+    fun `records without a matching callsign upload under the certificate and are reported`() {
+        runBlocking {
+            val storage = MemStorage()
+            val repo = LoTWUploadRepository(
+                storage,
+                { LoTWConfig(File("src/main/assets/lotw/config.tq6").inputStream()) },
+                now = { System.currentTimeMillis() }
+            )
+            repo.importCertificate(fixture("test_tqsl_empty.p12"), charArrayOf())
+            repo.saveStation(LoTWStation(grid = "OL62TI"))
+            val start = 1_787_000_000_000L // 2026-08, inside the fixture certificate's QSO range
+            val preview = repo.prepare(
+                listOf(
+                    sampleRecord(start, "BH6RJD", ""),
+                    sampleRecord(start + 60_000L, "BG7QBL", "XX0YY"),
+                    sampleRecord(start + 120_000L, "BA8BLK", "BA7OPF")
+                ),
+                resubmit = false
+            )
+            // The blank record is signed with the certificate's callsign; the one naming another
+            // callsign is refused and offered up for a rewrite instead.
+            assertEquals(2, preview.count)
+            assertEquals(1, preview.missingCallsign)
+            assertEquals(listOf(start + 60_000L), preview.callsignConflicts)
+            assertEquals(1, preview.unavailableReasons[LoTWProblem.CALLSIGN_MISMATCH])
+        }
+    }
+
+    /** Nothing signable at all: the preview still comes back (count 0) with the conflicts listed,
+     *  so the UI can offer the rewrite / use-another-certificate actions instead of a dead end. */
+    @Test
+    fun `fully blocked batch still returns a preview with the conflicts`() {
+        runBlocking {
+            val storage = MemStorage()
+            val repo = LoTWUploadRepository(
+                storage,
+                { LoTWConfig(File("src/main/assets/lotw/config.tq6").inputStream()) },
+                now = { System.currentTimeMillis() }
+            )
+            repo.importCertificate(fixture("test_tqsl_empty.p12"), charArrayOf())
+            repo.saveStation(LoTWStation(grid = "OL62TI"))
+            val start = 1_787_000_000_000L
+            val preview = repo.prepare(
+                listOf(
+                    sampleRecord(start, "BH6RJD", "XX0YY"),
+                    sampleRecord(start + 60_000L, "BG7QBL", "XX0ZZ")
+                ),
+                resubmit = false
+            )
+            assertEquals(0, preview.count)
+            assertEquals(2, preview.unavailableSkipped)
+            assertEquals(listOf(start, start + 60_000L), preview.callsignConflicts)
+            assertEquals(2, preview.unavailableReasons[LoTWProblem.CALLSIGN_MISMATCH])
+            assertEquals(0, preview.missingCallsign)
+            // No payload was prepared: confirming this preview must fail as expired, not crash.
+            assertTrue(repo.upload(preview.id) is LoTWUploadResult.ExpiredPreview)
+        }
+    }
+
+    /** The mismatch reason names both callsigns (record vs certificate). The old detail showed the
+     *  opposite station's call, which told the operator nothing about which side to fix. */
+    @Test
+    fun `callsign mismatch detail names the record and the certificate callsign`() {
+        runBlocking {
+            val storage = MemStorage()
+            val repo = LoTWUploadRepository(
+                storage,
+                { LoTWConfig(File("src/main/assets/lotw/config.tq6").inputStream()) },
+                now = { System.currentTimeMillis() }
+            )
+            repo.importCertificate(fixture("test_tqsl_empty.p12"), charArrayOf())
+            repo.saveStation(LoTWStation(grid = "OL62TI"))
+            val audit = repo.audit(listOf(sampleRecord(1_787_000_000_000L, "BH6RJD", "XX0YY")))
+            assertEquals("XX0YY ≠ BA7OPF", audit.details[LoTWProblem.CALLSIGN_MISMATCH])
+        }
+    }
+
+    private fun sampleRecord(start: Long, call: String, myCallsign: String) = QsoRecord(
+        id = start,
+        startUtcMillis = start,
+        endUtcMillis = start,
+        theirCallsign = call,
+        myCallsign = myCallsign,
+        myGrid = "OL62TI",
+        txFrequencyHz = 145_850_000L,
+        rxFrequencyHz = 436_795_000L,
+        band = "2M",
+        rxBand = "70CM",
+        mode = "FM",
+        satelliteName = "SO-50",
+        propagationMode = "SAT",
+        status = QsoStatus.COMPLETE
+    )
 }

core/data/src/test/java/com/rtbishop/look4sat/core/data/repository/QsoRepositoryTest.kt

@@ -295,6 +295,36 @@ class QsoRepositoryTest {
         assertEquals(1, dao.getAll().size)
     }
 
+    @Test
+    fun markUploaded_fillsBlankCallsignsAndKeepsTheOthers() = runBlocking {
+        val blank = dao.save(loggedInApp("SO-50", lotwUploaded = false).copy(myCallsign = "").toEntity())
+        val named = dao.save(loggedInApp("SO-50", lotwUploaded = false).copy(myCallsign = "BH3HCF").toEntity())
+
+        repository.markUploaded(listOf(blank, named), emptyList(), "BA7OPF")
+
+        val rows = dao.getAll().associateBy { it.id }
+        // Records logged before a certificate existed get the certificate's callsign; a record that
+        // names another callsign is not touched (they are refused, not rewritten, by the uploader).
+        assertEquals("BA7OPF", rows[blank]!!.myCallsign)
+        assertEquals("BH3HCF", rows[named]!!.myCallsign)
+        assertTrue(rows[blank]!!.lotwUploaded)
+        assertTrue(rows[named]!!.lotwUploaded)
+    }
+
+    @Test
+    fun rewriteMyCallsign_rewritesTheConflictRecordsOnly() = runBlocking {
+        val conflict = dao.save(loggedInApp("SO-50", lotwUploaded = false).copy(myCallsign = "XX0YY").toEntity())
+        val kept = dao.save(loggedInApp("SO-50", lotwUploaded = false).copy(myCallsign = "BA7OPF").toEntity())
+
+        val changed = repository.rewriteMyCallsign(listOf(conflict, kept), "ba7opf")
+
+        assertEquals(1, changed)
+        val rows = dao.getAll().associateBy { it.id }
+        assertEquals("BA7OPF", rows[conflict]!!.myCallsign)
+        assertEquals("BA7OPF", rows[kept]!!.myCallsign)
+        assertFalse(rows[conflict]!!.lotwUploaded)
+    }
+
     @Test
     fun markWavelogUploaded_setsTheFlagAndTheStationStamp() = runBlocking {
         val id = dao.save(loggedInApp("SO-50", lotwUploaded = false).toEntity())

core/data/src/test/java/com/rtbishop/look4sat/core/data/repository/SelectionRepoSearchTest.kt

@@ -284,6 +284,24 @@ class SelectionRepoSearchTest {
         assertEquals(sampleItems.map { it.catnum }.toSet(), results.map { it.catnum }.toSet())
     }
 
+    @Test
+    fun `selected satellites are shown first`() = runTest {
+        // Pinning ported from upstream: ticked satellites sort above the rest,
+        // each group keeping the name order.
+        val repo = createRepo(
+            items = listOf(
+                SatItem(catnum = 44444, name = "Zeta"),
+                SatItem(catnum = 25544, name = "Alpha"),
+                SatItem(catnum = 40967, name = "Beta")
+            )
+        )
+        val flow = repo.getEntriesFlow()
+        repo.setSelection(listOf(40967), true)
+        val results = flow.first()
+        assertEquals(listOf(40967, 25544, 44444), results.map { it.catnum })
+        assertEquals(listOf(true, false, false), results.map { it.isSelected })
+    }
+
     private fun createRepo(
         items: List<SatItem>,
         sstvIds: List<Int> = emptyList()

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/logbook/AdifCodec.kt

@@ -14,9 +14,15 @@ import java.util.Date
 import java.util.Locale
 import java.util.TimeZone
 
-/** Small ADI codec for the logbook's actual field set (ADIF 3.1.7). */
+/**
+ * Small ADI codec for the logbook's actual field set (ADIF 3.1.7).
+ *
+ * Grid directions follow ADIF: the un-prefixed fields (GRIDSQUARE, VUCC_GRIDS) belong to
+ * the OPPOSITE station, the MY_* fields (MY_GRIDSQUARE, MY_VUCC_GRIDS) to the operator.
+ */
 object AdifCodec {
     private val utc = TimeZone.getTimeZone("UTC")
+    private val gridPattern = Regex("[A-R]{2}[0-9]{2}([A-X]{2}([0-9]{2})?)?")
 
     fun encode(records: List<QsoRecord>, includeStationCallsign: Boolean = true): String = buildString {
         append(field("ADIF_VER", "3.1.7"))
@@ -36,7 +42,17 @@ object AdifCodec {
             appendOptional("MODE", record.mode)
             appendOptional("SUBMODE", record.submode)
             appendOptional("GRIDSQUARE", record.theirGrid)
+            // The OPPOSITE station's multi-grid set (2+ grids: a grid line or corner).
+            // A single grid is carried by GRIDSQUARE; one value inside the VUCC field
+            // makes Wavelog flag the record in its QSO view.
+            if (record.theirVuccGrids.size > 1) {
+                appendOptional("VUCC_GRIDS", record.theirVuccGrids.joinToString(","))
+            }
             appendOptional("MY_GRIDSQUARE", record.myGrid)
+            // The grid set this qso went out under (own operated grids, stamped at
+            // upload). ADIF's MY_VUCC_GRIDS is its home — not VUCC_GRIDS, which belongs
+            // to the opposite station and drives Wavelog's grid/distance/QRB display.
+            appendOptional("MY_VUCC_GRIDS", record.vuccGrids.joinToString(","))
             appendOptional("RST_SENT", record.sentReport)
             appendOptional("RST_RCVD", record.receivedReport)
             record.txFrequencyHz?.let { append(field("FREQ", hzToMhz(it))) }
@@ -49,7 +65,6 @@ object AdifCodec {
             if (record.lotwConfirmed) append(field("LOTW_QSL_RCVD", "Y"))
             if (record.lotwReceived) append(field("LOTW_QSL_SENT", "Y"))
             appendOptional("LOTW_QSLRDATE", record.lotwQslDate)
-            appendOptional("VUCC_GRIDS", record.vuccGrids.joinToString(","))
             record.dxcc?.let { append(field("DXCC", it.toString())) }
             appendOptional("COUNTRY", record.country)
             record.cqZone?.let { append(field("CQZ", it.toString())) }
@@ -80,7 +95,9 @@ object AdifCodec {
             theirCallsign = call,
             myCallsign = values["STATION_CALLSIGN"].orEmpty().uppercase(Locale.US),
             theirGrid = values["GRIDSQUARE"].orEmpty().uppercase(Locale.US),
+            theirVuccGrids = decodeGrids(values["VUCC_GRIDS"]),
             myGrid = values["MY_GRIDSQUARE"].orEmpty().uppercase(Locale.US),
+            vuccGrids = decodeGrids(values["MY_VUCC_GRIDS"]),
             sentReport = values["RST_SENT"].orEmpty(),
             receivedReport = values["RST_RCVD"].orEmpty(),
             txFrequencyHz = mhzToHz(values["FREQ"]),
@@ -100,8 +117,6 @@ object AdifCodec {
             lotwConfirmed = values["LOTW_QSL_RCVD"].equals("Y", true),
             lotwReceived = values["LOTW_QSL_SENT"].equals("Y", true),
             lotwQslDate = values["LOTW_QSLRDATE"].orEmpty(),
-            vuccGrids = values["VUCC_GRIDS"].orEmpty().split(',').map { it.trim().uppercase(Locale.US) }
-                .filter { it.matches(Regex("[A-R]{2}[0-9]{2}([A-X]{2}([0-9]{2})?)?")) }.distinct(),
             dxcc = values["DXCC"]?.toIntOrNull(),
             country = values["COUNTRY"].orEmpty(),
             cqZone = values["CQZ"]?.toIntOrNull()?.takeIf { it in 1..40 },
@@ -140,6 +155,12 @@ object AdifCodec {
         return records
     }
 
+    /** Splits an ADIF grid list on commas, keeping only valid 4/6/8-char locators. */
+    private fun decodeGrids(value: String?): List<String> = value.orEmpty().split(',')
+        .map { it.trim().uppercase(Locale.US) }
+        .filter { it.matches(gridPattern) }
+        .distinct()
+
     private fun StringBuilder.appendOptional(name: String, value: String) {
         if (value.isNotBlank()) append(field(name, value))
     }

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/logbook/IQsoRepository.kt

@@ -22,7 +22,14 @@ interface IQsoRepository {
      * signed with (1–4 gridsquares: inside a grid / on a line / on a corner), so the
      * logbook row can show which grids the QSO went out under.
      */
-    suspend fun markUploaded(ids: List<Long>, grids: List<String> = emptyList())
+    suspend fun markUploaded(ids: List<Long>, grids: List<String> = emptyList(), certificateCallsign: String = "")
+
+    /**
+     * Rewrites the operator's callsign on the given records. This is the answer to "these contacts
+     * were logged under another certificate — upload them under the one installed now". Returns the
+     * number of records that changed.
+     */
+    suspend fun rewriteMyCallsign(ids: List<Long>, callsign: String): Int
 
     /**
      * Marks the batch as uploaded to Wavelog (independent of the LoTW upload state) and

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/logbook/LoTWUploadMessages.kt

@@ -18,6 +18,7 @@
 package com.rtbishop.look4sat.core.domain.logbook
 
 import com.rtbishop.look4sat.core.domain.repository.LoTWProblem
+import com.rtbishop.look4sat.core.domain.repository.LoTWUploadAudit
 
 /**
  * Wording for the reasons a QSO cannot be signed for LoTW.
@@ -69,3 +70,14 @@ fun unavailableUploadSummary(
     val detail = parts.joinToString(", ").ifBlank { "check the logbook" }
     return "$subject — $detail"
 }
+
+/**
+ * True when a batch that has nothing uploadable still has to reach the preview dialog.
+ *
+ * The preview is the only place that carries the callsign-conflict actions (rewrite the records, or
+ * upload them under another certificate). Short-circuiting such a batch into the plain "can't be
+ * uploaded" message strands exactly the records the operator needs to act on — the message has no
+ * buttons to get out of, so those QSOs could never be uploaded.
+ */
+fun LoTWUploadAudit.needsPreviewForConflicts(): Boolean =
+    pending == 0 && (reasons[LoTWProblem.CALLSIGN_MISMATCH] ?: 0) > 0

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/logbook/QsoModels.kt

@@ -48,6 +48,8 @@ data class QsoRecord(
     val wavelogStation: String = "",
     val lotwReceived: Boolean = false,
     val lotwQslDate: String = "",
+    /** Own operated grid set this QSO went out under — uploaded as ADIF MY_VUCC_GRIDS
+     *  (never VUCC_GRIDS, which belongs to the opposite station). Stamped at upload. */
     val vuccGrids: List<String> = emptyList(),
     val dxcc: Int? = null,
     val country: String = "",

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/repository/ILoTWUploadRepository.kt

@@ -107,7 +107,13 @@ data class LoTWUploadPreview(
     val grids: List<String> = emptyList(),
     /** True when this batch is a resubmit: already-uploaded/confirmed records were allowed
      *  through so the corrected station location reaches LoTW as an update of the contact. */
-    val resubmit: Boolean = false
+    val resubmit: Boolean = false,
+    /** Records in this batch whose own callsign is blank (logged before a certificate was
+     *  installed). They are signed with [callsign]; a successful upload writes it into them. */
+    val missingCallsign: Int = 0,
+    /** Records refused because they name a different own callsign than [callsign]. The upload
+     *  flow offers either rewriting them with [callsign] or using the other certificate. */
+    val callsignConflicts: List<Long> = emptyList()
 )
 
 /** Pre-upload location check: the freshest known position grid is not covered by the

core/domain/src/test/java/com/rtbishop/look4sat/core/domain/logbook/AdifCodecTest.kt

@@ -10,6 +10,7 @@
 package com.rtbishop.look4sat.core.domain.logbook
 
 import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
 import org.junit.Assert.assertTrue
 import org.junit.Test
 
@@ -22,8 +23,10 @@ class AdifCodecTest {
             endUtcMillis = 1_700_000_000_100L,
             theirCallsign = "BG5JVM",
             myCallsign = "BA7OPF",
-            theirGrid = "OM60",
+            theirGrid = "EN52",
+            theirVuccGrids = listOf("EN52", "EN53"),
             myGrid = "OL62TI",
+            vuccGrids = listOf("OL62", "OL61"),
             sentReport = "59",
             receivedReport = "59",
             txFrequencyHz = 145_850_000L,
@@ -36,8 +39,7 @@ class AdifCodecTest {
             propagationMode = "SAT",
             status = QsoStatus.COMPLETE,
             lotwConfirmed = true,
-            lotwQslDate = "2026-09-20",
-            vuccGrids = listOf("OM60", "OM50")
+            lotwQslDate = "2026-09-20"
         )
         val decoded = AdifCodec.decode(AdifCodec.encode(listOf(record))).single()
         assertEquals(record.startUtcMillis, decoded.startUtcMillis)
@@ -47,12 +49,18 @@ class AdifCodecTest {
         assertEquals("2M", decoded.band)
         assertEquals("70CM", decoded.rxBand)
         assertTrue(decoded.lotwConfirmed)
-        assertEquals(listOf("OM60", "OM50"), decoded.vuccGrids)
+        // Grid directions survive a round trip: the opposite's set stays theirs,
+        // the operator's own set stays theirs.
+        assertEquals("EN52", decoded.theirGrid)
+        assertEquals(listOf("EN52", "EN53"), decoded.theirVuccGrids)
+        assertEquals("OL62TI", decoded.myGrid)
+        assertEquals(listOf("OL62", "OL61"), decoded.vuccGrids)
     }
 
     @Test
     fun decode_lotwStyleReportFields() {
-        // LoTW report subset: lowercase eor, alphabetical fields, VUCC_GRIDS list.
+        // LoTW report subset: lowercase eor, alphabetical fields. The un-prefixed
+        // grid fields belong to the OPPOSITE station, MY_* fields to the operator.
         val adi = """
             <EOH>
             <CALL:6>BH6RJD
@@ -64,8 +72,9 @@ class AdifCodecTest {
             <BAND:3>2M
             <BAND_RX:4>70CM
             <GRIDSQUARE:4>OM60
-            <MY_GRIDSQUARE:8>OM60IL70
             <VUCC_GRIDS:9>OM60,OM50
+            <MY_GRIDSQUARE:6>OL62TI
+            <MY_VUCC_GRIDS:9>OL62,OL61
             <STATION_CALLSIGN:6>BH6RJD
             <DXCC:3>318
             <COUNTRY:5>China
@@ -78,12 +87,27 @@ class AdifCodecTest {
         assertEquals("BH6RJD", record.theirCallsign)
         assertEquals("SO-50", record.satelliteName)
         assertEquals("FM", record.displayMode)
-        assertEquals("OM60IL70", record.myGrid)
-        assertEquals(listOf("OM60", "OM50"), record.vuccGrids)
+        assertEquals("OM60", record.theirGrid)
+        assertEquals(listOf("OM60", "OM50"), record.theirVuccGrids)
+        assertEquals("OL62TI", record.myGrid)
+        assertEquals(listOf("OL62", "OL61"), record.vuccGrids)
         assertTrue(record.lotwConfirmed)
         assertTrue(record.isSatellite)
     }
 
+    @Test
+    fun decodeWavelogPullStyleRecordKeepsGridDirections() {
+        // Wavelog's export: the OPPOSITE station's grids un-prefixed, the station
+        // profile's grid under MY_*. A pull must not flip them into each other.
+        val adi = "<EOH><CALL:6>BG5JVM<QSO_DATE:8>20260916<TIME_ON:4>0745" +
+            "<VUCC_GRIDS:9>EN52,EN53<MY_GRIDSQUARE:6>OL62TI<MY_VUCC_GRIDS:9>OL62,OL61" +
+            "<MODE:2>FM<PROP_MODE:3>SAT<SAT_NAME:5>SO-50<EOR>"
+        val record = AdifCodec.decode(adi).single()
+        assertEquals(listOf("EN52", "EN53"), record.theirVuccGrids)
+        assertEquals("OL62TI", record.myGrid)
+        assertEquals(listOf("OL62", "OL61"), record.vuccGrids)
+    }
+
     @Test
     fun encodeOmitsStationCallsignForWavelog() {
         val record = QsoRecord(
@@ -99,4 +123,44 @@ class AdifCodecTest {
         assertTrue(adif.contains("<CALL:6>N0CALL"))
         assertTrue(adif.contains("<SAT_NAME:5>SO-50"))
     }
+
+    @Test
+    fun encodeKeepsOwnGridsOutOfTheOppositeVuccField() {
+        // The reported defect: an operator's stamped own grid set must never land in
+        // VUCC_GRIDS — Wavelog displays that field as the OPPOSITE station's grid.
+        val record = QsoRecord(
+            startUtcMillis = 1_700_000_000_000L,
+            theirCallsign = "N0CALL",
+            myCallsign = "BA7OPF",
+            myGrid = "OL62TI",
+            vuccGrids = listOf("OL62"),
+            satelliteName = "SO-50"
+        )
+        val adif = AdifCodec.encode(listOf(record), includeStationCallsign = false)
+        assertTrue(adif.contains("<MY_VUCC_GRIDS:4>OL62"))
+        assertFalse(adif.contains("<VUCC_GRIDS:"))
+        assertFalse(adif.contains("<GRIDSQUARE:"))
+    }
+
+    @Test
+    fun encodeWritesTheOppositeMultiGridSetToVuccGrids() {
+        val multi = QsoRecord(
+            startUtcMillis = 1_700_000_000_000L,
+            theirCallsign = "N0CALL",
+            myCallsign = "BA7OPF",
+            theirGrid = "EN52",
+            theirVuccGrids = listOf("EN52", "EN53"),
+            satelliteName = "SO-50"
+        )
+        val multiAdif = AdifCodec.encode(listOf(multi), false)
+        assertTrue(multiAdif.contains("<GRIDSQUARE:4>EN52"))
+        assertTrue(multiAdif.contains("<VUCC_GRIDS:9>EN52,EN53"))
+
+        // A single opposite grid rides in GRIDSQUARE only; one value inside the VUCC
+        // field would trigger Wavelog's single-grid warning in its QSO view.
+        val single = multi.copy(theirVuccGrids = listOf("EN52"))
+        val singleAdif = AdifCodec.encode(listOf(single), false)
+        assertTrue(singleAdif.contains("<GRIDSQUARE:4>EN52"))
+        assertFalse(singleAdif.contains("<VUCC_GRIDS:"))
+    }
 }

core/domain/src/test/java/com/rtbishop/look4sat/core/domain/logbook/LoTWUploadMessagesTest.kt

@@ -0,0 +1,59 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.logbook
+
+import com.rtbishop.look4sat.core.domain.repository.LoTWProblem
+import com.rtbishop.look4sat.core.domain.repository.LoTWUploadAudit
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+/**
+ * The preview dialog is the only place carrying the callsign-conflict actions (rewrite / use another
+ * certificate), so a conflict-only batch must NOT be short-circuited into the plain
+ * "can't be uploaded" message: that dialog has no buttons to get out of.
+ */
+class LoTWUploadMessagesTest {
+
+    @Test
+    fun `conflict-only batch asks for the preview even with nothing pending`() {
+        assertTrue(audit(pending = 0, mismatch = 107, satellite = 1).needsPreviewForConflicts())
+    }
+
+    @Test
+    fun `blocked batch without conflicts keeps the plain message`() {
+        assertFalse(audit(pending = 0, mismatch = 0, satellite = 3).needsPreviewForConflicts())
+    }
+
+    @Test
+    fun `batch with something to upload never takes the conflict fallback`() {
+        assertFalse(audit(pending = 5, mismatch = 2, satellite = 1).needsPreviewForConflicts())
+    }
+
+    private fun audit(pending: Int, mismatch: Int, satellite: Int) = LoTWUploadAudit(
+        total = 108,
+        pending = pending,
+        uploaded = 0,
+        unknown = 0,
+        unavailable = 108 - pending,
+        reasons = buildMap {
+            if (mismatch > 0) put(LoTWProblem.CALLSIGN_MISMATCH, mismatch)
+            if (satellite > 0) put(LoTWProblem.SATELLITE, satellite)
+        }
+    )
+}

core/presentation/src/main/res/values-es/strings.xml

@@ -19,6 +19,10 @@
     <string name="sat_search_clear">Vaciar</string>
     <string name="sat_clear_all">Vaciar todo</string>
     <string name="sat_select_all">Seleccionar todo</string>
+    <string name="sat_group_selected">Seleccionados</string>
+    <string name="sat_group_available">Disponibles</string>
+    <string name="sat_group_selected_count">Seleccionados (%1$d)</string>
+    <string name="sat_group_available_count">Disponibles (%1$d)</string>
     <string name="sat_empty_list_message">
         Asegúrese de que su consulta de búsqueda sea correcta y que la base de datos esté actualizada</string>
     <string name="sat_warning_title">Alarma\!</string>

core/presentation/src/main/res/values-ru/strings.xml

@@ -19,6 +19,10 @@
     <string name="sat_search_clear">Очистить</string>
     <string name="sat_clear_all">Очистить</string>
     <string name="sat_select_all">Выбрать</string>
+    <string name="sat_group_selected">Выбранные</string>
+    <string name="sat_group_available">Доступные</string>
+    <string name="sat_group_selected_count">Выбранные (%1$d)</string>
+    <string name="sat_group_available_count">Доступные (%1$d)</string>
     <string name="sat_empty_list_message">Убедитесь, что ваш поисковый запрос верен и база данных обновлена</string>
     <string name="sat_warning_title">Внимание\!</string>
     <string name="sat_warning_message">

core/presentation/src/main/res/values-si/strings.xml

@@ -19,6 +19,10 @@
     <string name="sat_search_clear">පිරිසිදු ක°</string>
     <string name="sat_clear_all">සියල්ල පිරිසිදු ක°</string>
     <string name="sat_select_all">සියල්ල තෝරන්න</string>
+    <string name="sat_group_selected">තෝරාගත්</string>
+    <string name="sat_group_available">තිබෙන</string>
+    <string name="sat_group_selected_count">තෝරාගත් (%1$d)</string>
+    <string name="sat_group_available_count">තිබෙන (%1$d)</string>
     <string name="sat_empty_list_message">
         ඔබගේ සෙවුම් විමසුම නිවැරදි බවත් දත්ත සමුදාය යාවත්කාලීන කර ඇති බවත් සහතික කර ගන්න</string>
     <string name="sat_warning_title">අවවාදයයි\!</string>

core/presentation/src/main/res/values-tr/strings.xml

@@ -20,6 +20,10 @@
     <string name="sat_search_clear">Temizle</string>
     <string name="sat_clear_all">Tümünü temizle</string>
     <string name="sat_select_all">Tümünü seç</string>
+    <string name="sat_group_selected">Seçilenler</string>
+    <string name="sat_group_available">Kullanılabilir</string>
+    <string name="sat_group_selected_count">Seçilenler (%1$d)</string>
+    <string name="sat_group_available_count">Kullanılabilir (%1$d)</string>
     <string name="sat_empty_list_message">"Arama sorgunuzun doğru olduğundan ve veritabanının güncellendiğinden emin olun"</string>
     <string name="sat_warning_title">Uyarı\!</string>
     <string name="sat_warning_message">

core/presentation/src/main/res/values-uk/strings.xml

@@ -19,6 +19,10 @@
     <string name="sat_search_clear">Очистити</string>
     <string name="sat_clear_all">Очистити всі</string>
     <string name="sat_select_all">Вибрати всі</string>
+    <string name="sat_group_selected">Обрані</string>
+    <string name="sat_group_available">Доступні</string>
+    <string name="sat_group_selected_count">Обрані (%1$d)</string>
+    <string name="sat_group_available_count">Доступні (%1$d)</string>
     <string name="sat_empty_list_message">
         Переконайтеся, що ваш пошуковий запит правильний, а база даних оновлена</string>
     <string name="sat_warning_title">Увага\!</string>

core/presentation/src/main/res/values-zh/strings.xml

@@ -20,6 +20,10 @@
     <string name="sat_search_clear">清空</string>
     <string name="sat_clear_all">全部清空</string>
     <string name="sat_select_all">全选</string>
+    <string name="sat_group_selected">已选择</string>
+    <string name="sat_group_available">可用</string>
+    <string name="sat_group_selected_count">已选择（%1$d）</string>
+    <string name="sat_group_available_count">可用（%1$d）</string>
     <string name="sat_empty_list_message">请确保您的搜索查询正确且数据库已更新</string>
     <string name="sat_warning_title">警告\!</string>
     <string name="sat_warning_message">此应用收录了超过9000颗卫星信息\n同时追踪所有卫星并不现实\n建议始终通过搜索和分类筛选功能仅勾选您感兴趣的卫星</string>
@@ -216,6 +220,10 @@
     <string name="prefs_logbook_selected">已选 %1$d 条</string>
     <string name="prefs_logbook_select_hint">长按记录行可多选重传</string>
     <string name="prefs_logbook_resubmit_note">已上传记录将按当前台址就地更新；已被奖项使用的旧网格可能被拒绝。</string>
+    <string name="prefs_logbook_callsign_missing">其中 %1$d 条记录没有呼号，将按证书 %2$s 上传。</string>
+    <string name="prefs_logbook_callsign_different">%1$d 条记录登记的不是证书 %2$s 的呼号。</string>
+    <string name="prefs_logbook_callsign_rewrite">改写为 %1$s</string>
+    <string name="prefs_logbook_callsign_switch">换一张证书</string>
     <string name="prefs_logbook_station_label">台址</string>
     <string name="prefs_logbook_station_all">全部</string>
     <string name="prefs_logbook_upload_wavelog_title">上传到 Wavelog</string>

core/presentation/src/main/res/values/strings.xml

@@ -21,6 +21,10 @@
     <string name="sat_search_clear">Clear</string>
     <string name="sat_clear_all">Clear all</string>
     <string name="sat_select_all">Select all</string>
+    <string name="sat_group_selected">Selected</string>
+    <string name="sat_group_available">Available</string>
+    <string name="sat_group_selected_count">Selected (%1$d)</string>
+    <string name="sat_group_available_count">Available (%1$d)</string>
     <string name="sat_empty_list_message">"Make sure your search query is correct and the DB is updated"</string>
     <string name="sat_warning_title">Warning\!</string>
     <string name="sat_warning_message">
@@ -245,6 +249,10 @@
     <string name="prefs_logbook_selected">%1$d selected</string>
     <string name="prefs_logbook_select_hint">Long-press a row to re-upload corrected records</string>
     <string name="prefs_logbook_resubmit_note">Existing contacts will be updated in place — a grid already used for an award may be rejected.</string>
+    <string name="prefs_logbook_callsign_missing">%1$d record(s) have no callsign — signed with %2$s from the certificate.</string>
+    <string name="prefs_logbook_callsign_different">%1$d record(s) name another callsign than the certificate %2$s.</string>
+    <string name="prefs_logbook_callsign_rewrite">Rewrite with %1$s</string>
+    <string name="prefs_logbook_callsign_switch">Use another certificate</string>
     <string name="prefs_logbook_station_label">Station</string>
     <string name="prefs_logbook_station_all">All</string>
     <string name="prefs_logbook_upload_wavelog_title">Upload to Wavelog</string>

feature/radar/src/main/java/com/rtbishop/look4sat/feature/radar/LogPage.kt

@@ -262,7 +262,9 @@ fun LogPage(
                 preview = preview,
                 busy = logUiState.busy,
                 onConfirm = logViewModel::confirmUpload,
-                onDismiss = logViewModel::dismissPreview
+                onDismiss = logViewModel::dismissPreview,
+                onRewriteCallsign = logViewModel::rewriteCallsignConflicts,
+                onSwitchCertificate = logViewModel::switchCertificateForConflicts
             )
         }
     }
@@ -417,7 +419,9 @@ private fun UploadPreviewDialog(
     preview: com.rtbishop.look4sat.core.domain.repository.LoTWUploadPreview,
     busy: Boolean,
     onConfirm: () -> Unit,
-    onDismiss: () -> Unit
+    onDismiss: () -> Unit,
+    onRewriteCallsign: () -> Unit,
+    onSwitchCertificate: () -> Unit
 ) {
     AlertDialog(
         onDismissRequest = onDismiss,
@@ -427,7 +431,10 @@ private fun UploadPreviewDialog(
         text = {
             Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
                 Text("${preview.callsign}  DXCC ${preview.dxcc}  Grid ${preview.grid}", fontSize = 13.sp)
-                Text("${preview.count} QSO(s) · ${
+                val range = if (preview.firstUtc.isBlank()) {
+                    // A blocked batch (shown for its conflict actions) has no date range to show.
+                    "${preview.count} QSO(s)"
+                } else "${preview.count} QSO(s) · ${
                     java.text.SimpleDateFormat("MM-dd HH:mm", java.util.Locale.US).apply {
                         timeZone = java.util.TimeZone.getTimeZone("UTC")
                     }.format(java.util.Date(preview.firstUtc.let {
@@ -443,7 +450,8 @@ private fun UploadPreviewDialog(
                             timeZone = java.util.TimeZone.getTimeZone("UTC")
                         }.parse(it).time }.getOrDefault(System.currentTimeMillis())
                     }))
-                }Z", fontSize = 13.sp)
+                }Z"
+                Text(range, fontSize = 13.sp)
                 if (preview.skipped > 0 || preview.unknownSkipped > 0 || preview.unavailableSkipped > 0) {
                     val parts = buildList {
                         // skipped counts every record left out of this batch: previously-uploaded
@@ -464,11 +472,38 @@ private fun UploadPreviewDialog(
                     }
                     Text(parts.joinToString(" · "), fontSize = 12.sp, color = MaterialTheme.colorScheme.error)
                 }
+                if (preview.missingCallsign > 0) {
+                    // Logged while no certificate was installed; signed with the certificate's
+                    // callsign instead of being refused.
+                    Text(
+                        stringResource(R.string.prefs_logbook_callsign_missing, preview.missingCallsign, preview.callsign),
+                        fontSize = 12.sp,
+                        color = MaterialTheme.colorScheme.primary
+                    )
+                }
+                if (preview.callsignConflicts.isNotEmpty()) {
+                    // These name another callsign than the certificate: rewrite them with this
+                    // certificate's callsign, or upload them under the other certificate.
+                    Text(
+                        stringResource(R.string.prefs_logbook_callsign_different, preview.callsignConflicts.size, preview.callsign),
+                        fontSize = 12.sp,
+                        color = MaterialTheme.colorScheme.error
+                    )
+                    Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                        TextButton(onClick = onRewriteCallsign, enabled = !busy) {
+                            Text(stringResource(R.string.prefs_logbook_callsign_rewrite, preview.callsign), fontSize = 12.sp)
+                        }
+                        TextButton(onClick = onSwitchCertificate, enabled = !busy) {
+                            Text(stringResource(R.string.prefs_logbook_callsign_switch), fontSize = 12.sp)
+                        }
+                    }
+                }
                 Text(preview.contacts.joinToString("\n") { it }, fontSize = 12.sp, maxLines = 8)
             }
         },
         confirmButton = {
-            TextButton(onClick = onConfirm, enabled = !busy) { Text("确认上传") }
+            // Nothing uploadable (a conflict-only batch): the actions above are the way out.
+            TextButton(onClick = onConfirm, enabled = !busy && preview.count > 0) { Text("确认上传") }
         },
         dismissButton = {
             TextButton(onClick = onDismiss) { Text("Cancel") }

feature/radar/src/main/java/com/rtbishop/look4sat/feature/radar/LogViewModel.kt

@@ -18,6 +18,7 @@ import com.rtbishop.look4sat.core.domain.logbook.QsoRecord
 import com.rtbishop.look4sat.core.domain.logbook.QsoStatus
 import com.rtbishop.look4sat.core.domain.logbook.displayMode
 import com.rtbishop.look4sat.core.domain.logbook.frequencyBand
+import com.rtbishop.look4sat.core.domain.logbook.needsPreviewForConflicts
 import com.rtbishop.look4sat.core.domain.logbook.officialSatelliteName
 import com.rtbishop.look4sat.core.domain.logbook.satelliteIdentity
 import com.rtbishop.look4sat.core.domain.logbook.unavailableUploadSummary
@@ -286,7 +287,10 @@ class LogViewModel(
                 // LoTW-imported confirmations are the feedback side.
                 val pending = all.filter { !it.lotwConfirmed && !it.lotwUploaded && it.status == QsoStatus.COMPLETE }
                 val audit = lotwUploadRepository.audit(pending)
-                if (audit.pending == 0) {
+                // A batch held back only by callsign conflicts still gets the preview: that dialog
+                // carries the rewrite / use-another-certificate actions. Without this the operator
+                // gets a dead-end message and those records can never be uploaded.
+                if (audit.pending == 0 && !audit.needsPreviewForConflicts()) {
                     val msg = when {
                         audit.unavailable > 0 -> unavailableUploadSummary(
                             audit.unavailable, audit.reasons, audit.details, audit.duplicates, audit.incomplete
@@ -343,7 +347,7 @@ class LogViewModel(
             if (result is LoTWUploadResult.Accepted && lastUploadedIds.isNotEmpty()) {
                 // Mark the submitted QSOs as uploaded (distinct from confirmed) and stamp
                 // the station grids this batch went out under.
-                qsoRepository.markUploaded(lastUploadedIds, preview.grids)
+                qsoRepository.markUploaded(lastUploadedIds, preview.grids, preview.callsign)
                 lastUploadedIds = emptyList()
             }
             val msg = when (result) {
@@ -368,6 +372,34 @@ class LogViewModel(
 
     fun dismissPreview() = _uiState.update { it.copy(preview = null) }
 
+    /**
+     * Operator chose "rewrite" on the callsign conflict: the refused records get this certificate's
+     * callsign so the next upload can sign them. The prepared batch is dropped — nothing was sent.
+     */
+    fun rewriteCallsignConflicts() {
+        val preview = _uiState.value.preview ?: return
+        val ids = preview.callsignConflicts
+        if (ids.isEmpty()) return
+        viewModelScope.launch {
+            _uiState.update { it.copy(busy = true) }
+            val changed = qsoRepository.rewriteMyCallsign(ids, preview.callsign)
+            lotwUploadRepository.discardPreview()
+            lastUploadedIds = emptyList()
+            _uiState.update {
+                it.copy(busy = false, preview = null, message = "$changed record(s) rewritten to ${preview.callsign} — upload again")
+            }
+        }
+    }
+
+    /** Operator chose "use another certificate": that certificate is imported on the settings page. */
+    fun switchCertificateForConflicts() {
+        lotwUploadRepository.discardPreview()
+        lastUploadedIds = emptyList()
+        _uiState.update {
+            it.copy(preview = null, message = "Import the other callsign's certificate in Settings → LoTW upload, then upload again")
+        }
+    }
+
     fun dismissWavelogPreview() = _uiState.update { it.copy(wavelogPreview = null) }
 
     /**

feature/satellites/src/main/java/com/rtbishop/look4sat/feature/satellites/SatellitesScreen.kt

@@ -326,9 +326,52 @@ private fun SatellitesPreview() {
 
 @Composable
 private fun SatellitesCard(items: List<SatItem>, onSelected: (Int, Boolean) -> Unit) {
+    val selectedItems = items.filter { it.isSelected }
+    val availableItems = items.filterNot { it.isSelected }
+
     LazyVerticalGrid(columns = GridCells.Adaptive(320.dp)) {
-        items(items = items, key = { item -> item.catnum }) { entry ->
-            Satellite(entry, onSelected, Modifier.animateItem())
+        stickyHeader(key = "sat_summary_header") {
+            SummaryHeader(
+                selectedText = stringResource(R.string.sat_group_selected_count, selectedItems.size),
+                availableText = stringResource(R.string.sat_group_available_count, availableItems.size)
+            )
+        }
+
+        if (selectedItems.isNotEmpty()) {
+            items(items = selectedItems, key = { item -> item.catnum }) { entry ->
+                Satellite(entry, onSelected, Modifier.animateItem())
+            }
+        }
+
+        if (availableItems.isNotEmpty()) {
+            items(items = availableItems, key = { item -> item.catnum }) { entry ->
+                Satellite(entry, onSelected, Modifier.animateItem())
+            }
         }
     }
 }
+
+@Composable
+private fun SummaryHeader(selectedText: String, availableText: String) {
+    Row(
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.SpaceBetween,
+        modifier = Modifier
+            .fillMaxWidth()
+            .background(MaterialTheme.colorScheme.surfaceContainerHighest)
+            .padding(horizontal = 12.dp, vertical = 4.dp)
+    ) {
+        Text(
+            text = selectedText,
+            style = MaterialTheme.typography.titleSmall,
+            fontWeight = FontWeight.SemiBold,
+            color = MaterialTheme.colorScheme.onSurfaceVariant
+        )
+        Text(
+            text = availableText,
+            style = MaterialTheme.typography.titleSmall,
+            fontWeight = FontWeight.SemiBold,
+            color = MaterialTheme.colorScheme.onSurfaceVariant
+        )
+    }
+}

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/LogbookDialog.kt

@@ -103,6 +103,10 @@ fun LogbookDialog(
     onDismissMessage: () -> Unit,
     onIgnorePositionWarning: () -> Unit = {},
     onFixGrid: (List<String>) -> Unit = {},
+    /** Rewrite the records whose own callsign differs from the certificate's. */
+    onRewriteCallsign: () -> Unit = {},
+    /** Leave the upload to import a different certificate instead. */
+    onSwitchCertificate: () -> Unit = {},
     selectionMode: Boolean = false,
     selectedIds: Set<Long> = emptySet(),
     onStartSelection: (Long) -> Unit = {},
@@ -246,7 +250,9 @@ fun LogbookDialog(
             preview = preview,
             busy = uploadBusy,
             onConfirm = onConfirmUpload,
-            onDismiss = onDismissPreview
+            onDismiss = onDismissPreview,
+            onRewriteCallsign = onRewriteCallsign,
+            onSwitchCertificate = onSwitchCertificate
         )
     }
     if (uploadMessage.isNotBlank()) {
@@ -280,7 +286,9 @@ private fun LogbookUploadPreviewDialog(
     preview: com.rtbishop.look4sat.core.domain.repository.LoTWUploadPreview,
     busy: Boolean,
     onConfirm: () -> Unit,
-    onDismiss: () -> Unit
+    onDismiss: () -> Unit,
+    onRewriteCallsign: () -> Unit,
+    onSwitchCertificate: () -> Unit
 ) {
     AlertDialog(
         onDismissRequest = onDismiss,
@@ -291,7 +299,9 @@ private fun LogbookUploadPreviewDialog(
             Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
                 Text("${preview.callsign}  DXCC ${preview.dxcc}  Grid ${preview.grid}", fontSize = 13.sp)
                 Text(
-                    "${preview.count} QSO(s) · ${preview.firstUtc} – ${preview.lastUtc}",
+                    // A blocked batch (shown for its conflict actions) has no date range to show.
+                    if (preview.firstUtc.isBlank()) "${preview.count} QSO(s)"
+                    else "${preview.count} QSO(s) · ${preview.firstUtc} – ${preview.lastUtc}",
                     fontSize = 13.sp
                 )
                 if (preview.skipped > 0 || preview.unknownSkipped > 0 || preview.unavailableSkipped > 0) {
@@ -319,11 +329,39 @@ private fun LogbookUploadPreviewDialog(
                         color = MaterialTheme.colorScheme.primary
                     )
                 }
+                if (preview.missingCallsign > 0) {
+                    // Logged while no certificate was installed; signed with the certificate's
+                    // callsign instead of being refused.
+                    Text(
+                        stringResource(R.string.prefs_logbook_callsign_missing, preview.missingCallsign, preview.callsign),
+                        fontSize = 12.sp,
+                        color = MaterialTheme.colorScheme.primary
+                    )
+                }
+                if (preview.callsignConflicts.isNotEmpty()) {
+                    // These name another callsign than the certificate: the operator either rewrites
+                    // them with the certificate's callsign or uploads them under that other one.
+                    Text(
+                        stringResource(R.string.prefs_logbook_callsign_different, preview.callsignConflicts.size, preview.callsign),
+                        fontSize = 12.sp,
+                        color = MaterialTheme.colorScheme.error
+                    )
+                    Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                        TextButton(onClick = onRewriteCallsign, enabled = !busy) {
+                            Text(stringResource(R.string.prefs_logbook_callsign_rewrite, preview.callsign), fontSize = 12.sp)
+                        }
+                        TextButton(onClick = onSwitchCertificate, enabled = !busy) {
+                            Text(stringResource(R.string.prefs_logbook_callsign_switch), fontSize = 12.sp)
+                        }
+                    }
+                }
                 Text(preview.contacts.joinToString("\n") { it }, fontSize = 12.sp, maxLines = 8)
             }
         },
         confirmButton = {
-            TextButton(onClick = onConfirm, enabled = !busy) {
+            // Nothing uploadable (a conflict-only batch): the actions above are the way out, so the
+            // upload button stays disabled instead of failing with an expired preview.
+            TextButton(onClick = onConfirm, enabled = !busy && preview.count > 0) {
                 Text(stringResource(R.string.prefs_logbook_upload_confirm))
             }
         },

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsScreen.kt

@@ -308,6 +308,15 @@ private fun SettingsScreen(
             onConfirmUpload = { onAction(SettingsAction.ConfirmLogbookUpload) },
             onDismissPreview = { onAction(SettingsAction.DismissLogbookPreview) },
             onDismissMessage = { onAction(SettingsAction.ClearLogbookMessage) },
+            onRewriteCallsign = { onAction(SettingsAction.RewriteLogbookCallsigns) },
+            onSwitchCertificate = {
+                // The other callsign's certificate lives in the LoTW upload settings: leave the
+                // logbook and open that dialog.
+                onAction(SettingsAction.DismissLogbookPreview)
+                onAction(SettingsAction.ExitLogbookSelection)
+                dialogs.logbook = false
+                dialogs.lotwUpload = true
+            },
             onIgnorePositionWarning = { onAction(SettingsAction.IgnoreLogbookPositionWarning) },
             onFixGrid = { grids ->
                 onAction(SettingsAction.AbandonLogbookForGridFix)

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsState.kt

@@ -193,6 +193,7 @@ sealed interface SettingsAction {
     data object PrepareLogbookUpload : SettingsAction
     data object ConfirmLogbookUpload : SettingsAction
     data object DismissLogbookPreview : SettingsAction
+    data object RewriteLogbookCallsigns : SettingsAction
     /** The operator acknowledged the position mismatch and wants to upload anyway. */
     data object IgnoreLogbookPositionWarning : SettingsAction
     /** The operator chose to fix the station location first; the preview is discarded. */

feature/settings/src/main/java/com/rtbishop/look4sat/feature/settings/SettingsViewModel.kt

@@ -46,6 +46,7 @@ import com.rtbishop.look4sat.core.domain.repository.WavelogUploadOutcome
 import com.rtbishop.look4sat.core.domain.repository.WavelogUploadPreview
 import com.rtbishop.look4sat.core.domain.usecase.IShowToast
 import com.rtbishop.look4sat.core.domain.utility.VersionComparator
+import com.rtbishop.look4sat.core.domain.logbook.needsPreviewForConflicts
 import com.rtbishop.look4sat.core.domain.logbook.resubmitCandidates
 import com.rtbishop.look4sat.core.domain.logbook.toConfirmedRecord
 import com.rtbishop.look4sat.core.domain.logbook.unavailableUploadSummary
@@ -257,6 +258,7 @@ class SettingsViewModel(
             SettingsAction.PrepareLogbookUpload -> prepareLogbookUpload()
             SettingsAction.ConfirmLogbookUpload -> confirmLogbookUpload()
             SettingsAction.DismissLogbookPreview -> dismissLogbookPreview()
+            SettingsAction.RewriteLogbookCallsigns -> rewriteLogbookCallsigns()
             SettingsAction.IgnoreLogbookPositionWarning -> ignoreLogbookPositionWarning()
             SettingsAction.AbandonLogbookForGridFix -> abandonLogbookForGridFix()
             is SettingsAction.StartLogbookSelection -> startLogbookSelection(action.id)
@@ -575,7 +577,10 @@ class SettingsViewModel(
                 // LoTW-imported confirmations are the feedback side.
                 val pending = all.filter { !it.lotwConfirmed && !it.lotwUploaded && it.status == com.rtbishop.look4sat.core.domain.logbook.QsoStatus.COMPLETE }
                 val audit = lotwUploadRepository.audit(pending)
-                if (audit.pending == 0) {
+                // A batch held back only by callsign conflicts still gets the preview: that dialog
+                // carries the rewrite / use-another-certificate actions. Without this the operator
+                // gets a dead-end message and those records can never be uploaded.
+                if (audit.pending == 0 && !audit.needsPreviewForConflicts()) {
                     val msg = when {
                         audit.unavailable > 0 -> com.rtbishop.look4sat.core.domain.logbook.unavailableUploadSummary(
                             audit.unavailable, audit.reasons, audit.details, audit.duplicates, audit.incomplete
@@ -648,7 +653,7 @@ class SettingsViewModel(
             val result = lotwUploadRepository.upload(preview.id)
             val accepted = result is com.rtbishop.look4sat.core.domain.repository.LoTWUploadResult.Accepted
             if (accepted && lastLogbookUploadIds.isNotEmpty()) {
-                qsoRepository.markUploaded(lastLogbookUploadIds, preview.grids)
+                qsoRepository.markUploaded(lastLogbookUploadIds, preview.grids, preview.callsign)
                 lastLogbookUploadIds = emptyList()
             }
             val msg = when (result) {
@@ -673,6 +678,29 @@ class SettingsViewModel(
 
     private fun dismissLogbookPreview() = _uiState.update { it.copy(logbookPreview = null, logbookWavelogPreview = null) }
 
+    /**
+     * Operator chose "rewrite" on the callsign conflict: the refused records get this certificate's
+     * callsign so the next upload can sign them. The batch is discarded — nothing was uploaded.
+     */
+    private fun rewriteLogbookCallsigns() {
+        val preview = _uiState.value.logbookPreview ?: return
+        val ids = preview.callsignConflicts
+        if (ids.isEmpty()) return
+        viewModelScope.launch {
+            _uiState.update { it.copy(logbookUploadBusy = true) }
+            val changed = qsoRepository.rewriteMyCallsign(ids, preview.callsign)
+            lotwUploadRepository.discardPreview()
+            lastLogbookUploadIds = emptyList()
+            _uiState.update {
+                it.copy(
+                    logbookUploadBusy = false,
+                    logbookPreview = null,
+                    logbookUploadMessage = "$changed record(s) rewritten to ${preview.callsign} — upload again"
+                )
+            }
+        }
+    }
+
     /** Operator chose "ignore" on the position check: keep the prepared preview. */
     private fun ignoreLogbookPositionWarning() = _uiState.update { it.copy(logbookPositionWarning = null) }
 

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
 #noinspection UnusedVersionCatalogEntry
-appVersionCode = "576"
+appVersionCode = "580"
 #noinspection UnusedVersionCatalogEntry
-appVersionName = "4.4.8-ba7opf.11.1"
+appVersionName = "4.4.8-ba7opf.11.5"
 #noinspection UnusedVersionCatalogEntry
 compileSdk = "37"
 #noinspection UnusedVersionCatalogEntry